American Top 40


American Top 40 is an internationally syndicated, independent song countdown radio program created by Casey Kasem, Don Bustany, Tom Rounds and Ron Jacobs. The program is currently hosted by Ryan Seacrest and presented as an adjunct to his weekday radio program, On Air with Ryan Seacrest.
Originally a production of Watermark Inc., AT40 is now distributed by Premiere Networks. [|Nearly 430 radio stations in the United States, and several other territories worldwide] air AT40 making it one of the most listened-to weekly radio programs in the world. It can also be heard on iHeartRadio, TuneIn and the official AT40 applications on mobile smartphones and tablets as well as on Xbox 360, Xbox One, PlayStation 4 consoles and the Armed Forces Network. GEICO is the main sponsor for the show.
Co-creator Casey Kasem hosted the original AT40 from its inauguration on July 4, 1970, until August 6, 1988. Shadoe Stevens took over the program on August 13, 1988, and hosted until January 28, 1995, when the original program came to an end. Three years later, Kasem teamed up with Premiere's predecessor AMFM Radio Networks to relaunch AT40. Kasem, who had spent nine years hosting his own countdown for Westwood One, returned to hosting his creation on March 28, 1998. Seacrest took over AT40 on January 10, 2004, following Kasem's retirement from the series.
Currently, AT40 with Seacrest airs in two different formats, with one distributed to Contemporary Hit Radio stations and the other to Hot Adult Contemporary stations. However, there is no distinction made between the two shows on air. There are also two classic editions of the original AT40 distributed every weekend, featuring past Kasem-hosted shows from the 1970s and 1980s.
In its early years, the AT40 used the Billboard charts to compile the countdown, touting it as "the only source". The program subsequently switched to being based on Radio and Records airplay data upon its late 1990s return. The current source for the AT40 charts are unpublished mainstream Top 40 and hot adult contemporary charts compiled by Mediabase.
Through most of the 1980s, the countdown was compiled by Stu Jacobs.

History

1970–88: First Casey Kasem era

American Top 40 fittingly began on the Independence Day weekend in 1970, on seven radio stations, the first being KDEO in El Cajon, California, which broadcast the inaugural show the evening of July 3, 1970. Billboard reported prior to the release of the show that it had been sold to stations in 10 radio markets.
The chart data broadcast actually included the top 40 songs from the week ending July 11, 1970. The first show featured the last time both Elvis Presley and The Beatles had songs simultaneously in the Top 10. It was originally distributed by Watermark Inc., and was first presented in mono until February 24, 1973, when the first stereo vinyl copies were distributed. In early 1982, Watermark was purchased by ABC Radio and AT40 became a program of the "ABC Contemporary Radio Network". The program was hosted by Casey Kasem and co-created by Kasem; Don Bustany, Kasem's childhood friend from Detroit, MI; radio veteran Tom Rounds; and 93/KHJ Program Director Ron Jacobs, who produced and directed the various production elements. Rounds was also the marketing director; the initial funder was California strawberry grower Tom Driscoll.
The show began as a three-hour program written and directed by Bustany, counting down the top 40 songs on Billboard's Hot 100 Singles chart. The show quickly gained popularity once it was commissioned, and expanded to a four-hour-program on October 7, 1978, to reflect the increasing average length of singles on Billboard's Hot 100 chart. The producing staff expanded to eight people, some of them still in the business: Nikki Wine, Ben Marichal, Scott Paton, Matt Wilson, Merrill Shindler, Guy Aoki, Ronnie Allen and Sandy Stert Benjamin. By the early 1980s, the show could be heard on 520 stations in the United States and at its zenith, the show was broadcast on 1,000-plus stations in some 50 countries. Kasem told the New York Times in 1990 "I accentuate the positive and eliminate the negative. That is the timeless thing."

Features of the Kasem-era shows

During Kasem's run as host, the AT40 show had a number of popular and distinguishing features, some of which Kasem had done for some time at stations like KRLA in Los Angeles:
The top-ranking song on the chart always was introduced with one of these stories, which would be followed with a drum roll and the final reveal. Here is an example from the week of October 8, 1983:
In a 2007 Valentine's Day special edition of American Top 10, Kasem explained that the LDD feature was intended to be part of the show from the beginning. He knew, however, that it was going to take some time before a listener wrote in with a request and let the process proceed organically. Kasem's patience proved correct, as staffer Matt Wilson found such a letter while checking the show's mail in August 1978. The listener asked Kasem to play the song "Desiree" by Neil Diamond, which he dedicated to his girlfriend of the same name who was moving to West Germany to live with her family on an Army base. The request was fulfilled on the weekend of August 26, 1978; when that show was rebroadcast the weekend of August 25–26, 2007, Kasem recorded two optional segments in which he did phone interviews with the man and his former girlfriend about the LDD. Most shows featured two long distance dedications, usually with one during each half of the show. This feature endured on AT40 into Shadoe Stevens' run as host of the show, from 1988 to 1995, and also followed Kasem on his Westwood One shows, first as "Request and Dedication", and then back to LDD when he returned to AT40 in 1998. Long Distance Dedications were dropped after Ryan Seacrest became host in 2004, but they continued as part of Kasem's adult contemporary countdowns.
Although the show's format implied an average of ten countdown songs per hour, this was not rigidly enforced; however, by the mid-1980s, it had become increasingly rare for the final hour of the show to have any more than the top eleven or any fewer than the top nine songs left to play. The songs' run times determined how many would comfortably fit into each hour. The show bent to fit the Billboard rankings, and some songs had to be edited, with a verse or chorus cut, in order to fit into the show. But Kasem and his producers never lost sight of the stations carrying their show, and that the stories behind the songs were the chief reason that listeners tuned to AT40.

1988–95: Shadoe Stevens era

In 1988, Kasem left the show over contract concerns with ABC and signed with Westwood One to host a competing weekly countdown. Industry trade paper Billboard magazine reported that the main disputes between Kasem and Watermark/ABC were over his salary, because of declining ratings and a smaller group of stations airing the show. Casey's final AT40 show, the 940th in the series, aired on August 6, 1988. At no point during that final show did Kasem ever let on that any changes were afoot. However, he closed the show by telling the audience to catch him on the television show America's Top 10 and did not plug the following week's AT40. The #1 song during Casey's final show in the original AT40 era was "Roll with It" by Steve Winwood.
Kasem was replaced by Shadoe Stevens, whose first American Top 40 show aired on August 13, 1988, on 1,014 stations. To introduce Stevens to the audience, a two-minute cold open was recorded to start the show with Stevens making his way to the studio through the show's fictitious hall of history; Kasem was mentioned during the course of the open, as a "giant marble statue" of him helped guide Stevens to the studio. The change did not do much to stem the decline as loyal listeners did not take to Stevens as they had to Kasem.
Later, Stevens and AT40 lost a significant number of affiliates when, on January 21, 1989, Kasem's Westwood One show launched. The program, titled Casey's Top 40, used the weekly chart survey published by Radio & Records instead of the Billboard chart AT40 was still using. Further complications arose when some stations that stayed with Stevens also added Kasem's new show.
In an attempt to win back an audience, AT40 tried new features, including interview clips, music news, top 5 flashbacks, and previews of upcoming chart hits. It also stopped using the Hot 100 chart, switching first to the Hot 100 Airplay chart and finally to the Mainstream Top 40 chart. Later still, the countdown would use what was called a "No Nuttin'" gimmick that drew criticism; at various points of the show, a song would start immediately after the jingle for its position on the chart was played and Stevens would not offer any commentary until it concluded.
ABC kept American Top 40 in its syndication lineup despite the continued lack of improvement in ratings, but in 1994 the network finally decided to look elsewhere. ABC announced it would be acquiring the Rick Dees Weekly Top 40, which was using the same charts that Casey's Top 40 was, and that they would no longer carry American Top 40 as a result. The final AT40 for ABC aired on July 9, 1994, five days after its twenty-fourth anniversary. Radio Express, founded by original show creator Tom Rounds, kept AT40 in production following the move by ABC as the program was still carried in foreign markets. It was under Radio Express that the show finally came to an end nearly seven months later in the remaining markets that were carrying it, which by this point consisted entirely of overseas affiliates.
The very last original AT40 aired on January 28, 1995, and it ended with an extended last segment. As usual, the #2 song on the chart led it off; that song was "Another Night" by Real McCoy, which had been the #1 song one week earlier. Stevens then took a moment to thank the listeners for their support over the previous twenty-four plus years and played one last Long Distance Dedication, sent by him to the fans. After going into depth about his potential choices, Stevens revealed his selection to be " Move On" by James Brown. Stevens then gave a rundown of how many songs had been played over the series' entire run to that point, with a final total of 552 different chart toppers, including the one he was about to play as it returned to the top of the chart that week: "On Bended Knee" by Boyz II Men. As Stevens then read the credits and signed off for the final time, he played one final song. Perhaps appropriately, considering the circumstances, the song was "Happy Trails".

1998–2004: ''American Top 40'' returns; second Casey Kasem era

As fate would have it, a chain of events happening approximately three years after the original American Top 40 came to an end would soon result in the return of the program to the airwaves with its original host at the helm.
ABC Radio’s option to keep the branding expired in 1997 and as per an agreement struck before Shadoe Stevens took over as host, if ABC had ever decided to cancel AT40 outright and not come up with a new version before the option ran out, the rights to the branding would revert back to the original creators of the show. When the deal was struck that meant Casey Kasem and Don Bustany’s production company would benefit. Bustany left the program shortly after Kasem did, however, and chose not to have any further involvement. This left Kasem as the sole owner of the brand.
As this was going on, Kasem was about to end his eighth full year working for Westwood One after having re-signed with the network in 1993. The relationship, however, had significantly deteriorated over the previous four years. Over the course of that period, Westwood One had been acquired by Infinity Broadcasting, which was later absorbed into CBS Radio. Kasem was not pleased by what he perceived to be missed opportunities for cross promotion with other CBS properties as well as being treated as a less important figure than some of the other hosts on the network. Westwood One, meanwhile, had a series of issues of their own with Casey’s Top 40; while the show was still successful it had been dropped in both New York and Los Angeles, and the advertising revenue generated by the show did not justify the salary demands Kasem was making. The network also did not want to use the AT40 branding.
The sides eventually put aside their differences, with Westwood One deciding that losing Kasem to a competitor was not worth their trouble and Kasem signed on for one more year in December 1997. However, after the February 21, 1998 edition of his weekend countdowns, Kasem disappeared from the airwaves without notice and, unbeknownst to Westwood One, with no intention of returning to work
Chancellor Media, a forerunner of iHeartRadio, and Kasem began negotiations to relaunch AT40 for its newly launched syndication service called AMFM Radio Networks. A deal was finalized shortly after Kasem’a abrupt departure from Westwood One where Chancellor would become owners of the AT40 franchise and Kasem would return to his creation as host. Westwood One was not happy with this development and filed a breach of contract lawsuit against Kasem, who claimed contractual vagueness gave him the right to seek employment elsewhere.
The revival of AT40 premiered the weekend of March 28, 1998, one week after Westwood One finally cancelled the three countdowns Kasem was hosting for them after four weeks without him. Chancellor also brought Kasem's AC countdowns to their network, with both now being branded as American Top 20. Following the merger between Chancellor/AMFM and Clear Channel Communications in 1999, AT40 and other syndicated shows from AMFM Radio Networks were transferred into Premiere Radio Networks, which continues to syndicate the show as of today.
The resurrected American Top 40 kept the Radio and Records CHR/Pop chart previously used for Casey's Top 40 and was used as the basis for the show for the majority of this period. The only exception was a brief period from October 2000 to August 2001 when an obscure Mediabase chart was used. This chart had a rather ambiguous recurrent rule, which would see songs removed weekly from the chart from as high as #10, while that chart also resulted in songs that charted/peaked lower than #40 on Radio & Records pop charts to appear on the AT40 charts. By the time Kasem's last show aired, the show had gone back to using Mediabase's charts.
In December 2003, as part of a new deal with Premiere Radio Networks, Kasem announced that he would retire from hosting American Top 40 so he could focus on his duties hosting Hot AC and AC versions of the show, American Top 20. He also announced that the new host of AT40 would be Ryan Seacrest, an afternoon DJ host from KYSR who was rapidly gaining stardom from his hosting of the successful music reality TV show. American Idol.
Kasem's last show as host of AT40 aired on the weekend of January 3/4, 2004. His final #1 was Outkast's "Hey Ya!", which hit the top of the chart on the weekend of December 13, 2003.

2004–present: Ryan Seacrest era

On January 10, 2004, American Idol host Ryan Seacrest took over the hosting duties of American Top 40 from Kasem, although Kasem would continue to host American Top 20 and American Top 10 until his retirement in July 2009. With the host change, AT40 underwent a makeover, using a new theme song and introducing several new features. These extras included interviews with celebrities, a gossip section, and an update on movies screening in cinemas. Other extras inducted on a regular basis include "AT40 Breakout", a song predicted to crack the chart within the next few weeks ; "Request Line", a segment in which Ryan Seacrest will play a song requested by a listener; "Double Play", a former hit from the artist just played; "AT40 Sleaze" ; and "AT40 Rewind", a hit song from the past decade or so. In between songs, Seacrest and his guest hosts often make deadpan one-liners while writers and producers can be heard laughing frequently, including the security guard "Roger". Additionally, Seacrest initially opened most shows by playing the previous week's #1 song, as Kasem often did in the 1980s; this was discontinued after 2006, but in mid-2009 Seacrest began including a shorter recap segment in the show's introduction, in which he would play brief segments of the previous week's top three hits. In December 2004, the Hot AC version of the show debuted, giving both Seacrest and Kasem competing countdowns in the same format until 2009.
The show also began using a new chart that used no recurrent rule. On the first show with Ryan Seacrest, this led to several older songs reappearing after having dropped off many weeks earlier. Over the long term, it meant songs could spend long runs for about a year on the chart even after they went to recurrent status on other published charts. "Here Without You" by 3 Doors Down set a longevity record in 2004 for the CHR show by lasting 50 weeks before finally falling off. In 2006, "Scars" by Papa Roach would go on to tie the record. In 2011, Taio Cruz set AT40's all time longevity record with his song "Dynamite". This hit remained on the chart for 72 weeks, from July 2010 to November 2011. On the Hot AC version of AT40, "Use Somebody" by Kings of Leon set the all-time record in 2011 at 117 consecutive weeks. American Top 40 also became more interactive, involving online song voting and e-mail. In December 2006, the series' website was revamped, and the online song voting was discontinued in favor of publishing the Hot AC chart. The website also includes a toll-free number where fans can make requests and "shoutouts", as they would to a local radio station, and by 2009 replayed clips of shoutouts became part of the show. Online song voting was later reinstated, with results of votes on American Top 40's website factored into the chart rankings. AT40 was also expanded to social media through Twitter and Facebook where listeners from around the world will request a song to be included in the AT40 Extra segment, as well as their own mobile application which is available for free download on the Apple AppStore for iOS devices and on Google Play for Android devices.
In March 2010, Premiere Radio Networks announced that "American Top 5," a condensed daily top-5 countdown, would begin airing as part of the daily radio program On Air, also hosted by Seacrest.
In March 2016, the show underwent some minor changes. "Tell Me Something Good", a segment from Seacrest's weekday show On Air, was added to American Top 40. Additionally, any "extra" songs that aired during the show are announced by Seacrest before playing. The following month, the show resumed mentioning some of its affiliates around the world during the show.
When Seacrest was named the new co-host of Live with Kelly on May 1, 2017, he began to host the show from WHTZ in New York. Another studio near the Live with Kelly set was set up for On Air. Various guest hosts, however, will continue to do hosting duties from its original Hollywood studios when Seacrest is not around.
In February 2018, the show introduced new jingles with new voiceover artists replacing Dave Foxx and Kelly Doherty, who departed iHeartMedia in January.
In March 2020, due to the COVID-19 pandemic, Seacrest started to host AT40 from his house; the show also included pre-recorded messages from artists thanking healthcare workers and encouraging listeners to stay home, practice social distancing, and to keep in touch with loved ones.
, American Top 40 is produced by Easton Allyn and Jennifer Sawalha, and engineered by James Rash.

Competition

American Top 40 has faced numerous competitors since its debut in 1970. These include The Weekly Top 30 with Mark Elliot, several Dick Clark hosted shows starting in 1981 with the National Music Survey, and the Rick Dees Weekly Top 40, which has run continuously since 1983 with Rick Dees as host. Numerous other shows following the same format, both in the general top-40 category and in various specific radio formats, have aired over the course of AT40's history. In addition to Dees's show, Sean "Hollywood" Hamilton, Carson Daly, the hosts at Radio Disney, and Mike Savage, all host competing countdown shows targeted at the pop top 40 market.

Reairing of older shows

AT40 flashback

From January 2001 to December 2002, many radio stations aired reruns of 1980–88 episodes under the title American Top 40 Flashback. The show was syndicated by Premiere Radio Networks. In its early weeks the shows were the original four-hour format of an American Top 40 episode, but after the first month and a half the show was reduced to three hours. Although the national syndication of American Top 40 Flashback ceased in December 2002, radio station WMMX in Dayton, Ohio, continued to carry American Top 40 Flashback on Saturday mornings until the premiere of Casey Kasem's American Top 40: The 80s.

Casey Kasem's American Top 40—the 70s and 80s

On August 4, 2006, XM Satellite Radio began replays of the original 1970s and 1980s AT40 shows with Casey Kasem that were digitally remastered from the original vinyl LPs and open-reel master tapes by Shannon Lynn of . The event began with a weekend long marathon of original shows, with AT40 then being added as a regular show on two of XM's Decades channels, "The 70s on 7" and "The 80s on 8". With the merger of Sirius Satellite Radio and XM Satellite Radio, these AT40 shows began airing on both services on November 15, 2008. On the 70s on 7, it replaced the 'Satellite Survey', a Top 30 countdown of 1970s hits, produced by Sirius and hosted by Dave Hoeffel. On the 80s on 8, it replaced 'The Big 40' countdown produced by Sirius and hosted by Nina Blackwood. As of October 11, 2009, Sirius XM replaced the AT40 countdown on 80s on 8 and debuted a revised version of 'The Big 40' countdown now co-hosted by three of the five original MTV VJs: Nina Blackwood, Mark Goodman and Alan Hunter.
Sirius XM "70s on 7" currently runs AT40 each Saturday at 12PM with encore broadcasts the following Sunday at 9AM and at 12 midnight. Most show dates roughly correspond to the current week in real time. The mix of AT40 episodes being run on XM include the year-end countdowns, which are typically run in two parts: the first half in one time slot, and then the second half in the following time slot. The AT40 specials are also part of XM's rotation; for instance, "AT40 Goes to the Movies" aired prior to the 2007 Academy Awards, and on February 24, "The Top 40 Acts of the 80s So Far" aired on XM 80s the first week of July 2007. Also, "The Top 40 Songs of the Disco Era " aired on Sirius XM "70s on 7" the second weekend of July 2011.
From October through early November 2006, oldies radio station KQQL in Minneapolis/St. Paul, which is owned by Clear Channel Communications, ran a series of American Top 40 episodes from the 1970s. Aside from one week, when the station attempted to air a four-hour episode from 1979 in the three-hour timeslot, this test run was largely successful. Because of the success, Premiere Radio Networks decided to launch "" into national syndication featuring the three-hour shows from 1970 to 1978, and the last three hours of shows originally aired from October 1978 through December 1979. Starting in 2012, whenever programs from 1970 to 1972 were scheduled to air, Premiere began offering affiliates the option of airing a later 1970s program instead.
The 1980s version premiered on April 8, 2007, replacing the American Top 40 Flashback reruns. The shows are available in either their full original four-hour format, or an abbreviated three-hour version that omits the first hour of the show. To date, the latest program to air as part of the "AT40: The 80s" package has been August 6, 1988 – Kasem's last show with the original program. Due to the rights to Shadoe Stevens-era episodes being held by Cumulus Media, no programs from August 13, 1988, to 1995 have been re-aired as part of this or any similar block.
To date, the only re-aired classic AT40 programs that featured a host other than Kasem are the shows of March 25, 1972, with Dick Clark as host, and September 12, 1981, with Gary Owens as host. Both have been aired as tributes after Clark's and Owens' deaths.
Newly produced extra segments hosted by voiceover talent Larry Morgan are available for use at stations' discretion. Prior to Casey leaving Premiere Radio, these segments were hosted by his son Mike; when the series first began, these segments were hosted by one of Casey's former guest hosts, Ed McMann. These extra segments are also heard on the 80s show. KQQL was the first to sign on, airing programs beginning on December 30, 2006. Typically, the "optional extras" were songs that had yet to enter the top 40 of the Hot 100. However, some songs never reached the top 40 but had since become popular at classic hits/oldies/classic rock stations, while others were tributes to performers who had just died. For early 1970s programs, some of the "optional extras" were actually extras that were originally a part of the original program; in this case, Kasem's original commentary and introduction of the song were kept intact, in lieu of Morgan's voiceover.
In March 2008, XM Satellite Radio rebranded the XM broadcasts with the "Casey Kasem's American Top 40" name and logo used for terrestrial broadcasts, although XM still aired the commercial-free broadcasts, while Premiere Radio carries edited and recut broadcasts with commercials. Following the merger of Sirius and XM, the AT40 shows airing on those platforms have occasionally been edited. In some cases, extras and LDDs have been cut from the original broadcasts.
Sirius XM 70s on 7 aired the inaugural AT 40 on July 4, 2013, as part of a special July 4 broadcast.
As of 2017, American Top 40: The 70s & 80s are produced by Toby James Petty and engineered by Shannon Lynn, both of whom had been members of the current AT40 production staff prior to Kasem's 2004 departure.
As of 2014, American Top 40: The 70s shows that were originally produced in mono are being converted to true stereo by Ken Martin.
As of 2019, shows from the 1970s and 1980s are airing continually, without commercials, on the iHeartRadio station "". Most of iHeart's branded stations utilize an HD Radio subchannel in one of their markets to originate their app-only stations, and in this case, WMMX-HD2 in Dayton, Ohio, carries it over-the-air in that market.
As of April 2020, rebroadcast shows are currently aired on 200 radio stations in 7 countries and every U.S. state except Montana. Foreign rebroadcast shows are heard in four of the eastern provinces of Canada, as well as the American Forces Network, Australia, Bangalore, Berlin, Aruba, Hyderabad, Mozambique, and the United Kingdom.

Chart data used by American Top 40

''Billboard'' magazine

AT40 used the top 40 songs from the Billboard Hot 100 singles chart from the show's inception in 1970 to November 23, 1991. The chart was widely regarded as the industry standard for tracking the popularity of singles, and was thus a natural choice to be used. Kasem would frequently announce during the show that Billboard was the only source for the countdown. While using these charts worked well for the first half of the 1970s, as music changed during the decade and disco became popular on the charts, some rock stations began to drop the show because of complaints from program directors that AT40 was playing too many songs not normally heard on their stations.
This gradually became a wide schism as rock splintered into several formats in the early 1980s. As a result, AT40's weekly playlist could be very diverse in the styles and formats of the songs played. Historians have noted that no one station actually played all of the songs on the Billboard Hot 100 list, because they represented overlapping formats, such as hard rock, mainstream rock, heavy metal, dance, new wave, punk, rap, pop, easy listening/adult contemporary and country. Stations tended to specialize in only one or two of these formats and completely ignore the others.
One solution for the AT40 producers was to air frequent specials that concentrated on the classic music of the past, such as Rock in the Movies and Top Hits of the Seventies. But as Top 40 stations evolved into CHR, they began to avoid syndicated shows like AT40, preferring to stick with their own special niche formats.
By the early 1990s, many singles, mostly of the rap, heavy metal or grunge genres, reached the chart based on strong sales despite low airplay; several were very long, others were too controversial or risqué for mainstream airplay. These songs would generally only be aired in brief snippets during the show.
Because of this, American Top 40 switched to the Hot 100 Airplay chart. These songs generally scored much higher radio airplay, and some were not even released as singles. During this time, a few songs made very high debuts, including two that almost debuted in the #1 spot: "I'll Be There" by Mariah Carey, which entered at #4, and "Erotica" by Madonna, which entered at #2.
In January 1993, American Top 40 switched charts again, this time to the Billboard Top 40 Mainstream chart. This chart had more mainstream hits but fewer urban, dance and rap songs.
AT40 did not always use the official year-end Billboard chart during the 25 years in which the show used Billboard charts. In 1972, 1973 and 1977, as well as 1980-1984 and 1990-1994, AT40 compiled its own year-end chart. These charts were often close to Billboard's, but AT40 would use a mid-December to early-December time period while Billboard's survey year varied from year to year. AT40 matched Billboard's #1 year-end song every year except 1977, 1984, 1990 and 1993.

''Radio & Records'' magazine

With the show's revival in 1998, a new chart was implemented, the top 40 portion of Radio and Records CHR/Pop top 50 chart, which was already in use on Casey's Top 40. This chart used a recurrent rule that removed songs below #25 that had exceeded 26 weeks in the top 50; these removals, if they occurred in the top 40, would be reflected on the appropriate week's program. In 1999, the rule was modified to further restrict long chart runs: songs falling below #20 with at least 20 weeks in the top 50 would now be removed.
On October 21, 2000, American Top 40 began using an unpublished chart on a weekly basis for the first time in its history. The chart seemed to be a variant of the CHR/Pop chart provided by Mediabase, the data provider to Radio & Records. The most noticeable feature of this new chart was its ambiguous recurrent rule. Songs would be removed regularly from within the top 15, seemingly regardless of the number of weeks they had spent on the chart. Additionally, the chart has resulted in songs that otherwise peaked at #41-50 on R&R's charts appearing on the AT40 charts. This chart lasted until August 11, 2001, when AT40 returned to the Radio & Records pop chart. The return coincided with another modification in the recurrent rule; songs would be removed below #25 after three consecutive weeks without a bullet. This change would be short-lived, as in November 2001, Radio & Records returned to the 20 weeks/below #20 rule, which remained in place for the remainder of Kasem's tenure.

Spin-off programming

Adult Contemporary countdowns

When Casey Kasem joined what was then AMFM Radio Networks, he had been doing two weekly countdowns for adult contemporary formatted stations. Both of these shows would find a home with him at his new syndicator and were rebranded once he joined. Both shows took the name American Top 20 and launched the same weekend as Kasem's new AT40. He would concurrently host both shows with AT40 until he handed the show over to Ryan Seacrest in January 2004, then continue as host of the AC countdowns until he retired in 2009. After Kasem retired, the Hot AC American Top 20 and the Adult Contemporary American Top 10 were discontinued.

Television spinoff

From 1980 to 1992, a video version of the show entitled America's Top 10 was aired in syndication to television stations across the United States. Kasem hosted this version from 1980 to 1989. When Kasem left American Top 40 in 1988, he remained as host of America's Top 10 until the end of 1989, when he would be replaced by Siedah Garrett and later Tommy Puett. Kasem returned by 1991, and the show ran until 1992.

Other formats

Based on the success of American Top 40, Kasem and Don Bustany created a spinoff top 40 countdown for Watermark for Country Radio called American Country Countdown, patterned after Kasem's program. "ACC" premiered in 1973, and was hosted by Don Bowman from its inception until April 1978. Bob Kingsley replaced Bowman and hosted until the end of 2005, after which Kix Brooks of the late country music duo Brooks & Dunn took over; Brooks has been hosting ACC since. Kingsley later moved to another program, Country Top 40, which follows the same format as AT40 and ACC; Kingsley died on Thursday, October 17, 2019. Both ACC and CT40 remain on the air: ACC on Westwood One and CT40, now hosted by Fitz, syndicated by Hubbard Broadcasting.
After Kasem left ABC, the network launched American Gold, a spinoff oldies countdown hosted by Dick Bartley. American Gold's last show aired at the end of March 2009, replaced with another show hosted by Bartley for United Stations Radio Networks, Classic Countdown.
The American Top 40 format was adapted in an Australian show titled Take 40 Australia, similarly counting down the top 40 songs in the country.

Censorship, offensive songs and affiliate standards

Casey Kasem and Watermark's policy regarding putting American Top 40 together was to always play the forty most popular songs in the United States and never to ban a record from the countdown. However, whenever songs with potentially offensive lyrical content made the top 40, Watermark would send out memos to affiliated stations alerting them of the presence of that song in the countdown and sometimes provide stations with suggestions on how to edit the song out of their AT40 broadcasts.

Offensive content

The first song to receive this advisory was in April and May 1971, with a spoken word piece, "The Battle Hymn of Lt. Calley", by Terry Nelson and C-Company. Some better-known songs which received this treatment included "Kodachrome" by Paul Simon, "Roxanne" by The Police, "Ain't Love a Bitch" by Rod Stewart, and "Paradise by the Dashboard Light" by Meat Loaf.
Perhaps the most infamous of these songs was Chuck Berry's number-one hit "My Ding-a-Ling", which put some stations in the odd position of having to air AT40 without playing the number one song; at least one station, KELI in Tulsa, Oklahoma, censored out the song at its #1 position, replacing it with a message from station management, explaining why they chose to censor the program. The censorship of this song continued even into the twenty-first century; some stations, such as WOGL in Philadelphia, replaced this song with an optional extra when it aired a rerun of the November 18, 1972, broadcast on December 6, 2008.
In the summer of 1977, radio station KRNQ in Des Moines, Iowa, edited out "The Killing of Georgie" by Rod Stewart, because of the subject matter of a homosexual being murdered; that song peaked at #30 on the countdown.
In 1978, when Billy Joel's "Only the Good Die Young" was on the charts, AT40 had placed warnings in shipments to warn affiliates in highly Catholic populated areas along with a special break in the countdown for stations to substitute another song in its place. The affiliates usually used the suggestion, though some did not and no major complaints were ever heard.
In situations where a charting song contained offensive language and the record company was unable to provide AT40 with a clean edit of the song, the producers would often make an edit themselves. Such was a case with Bob Dylan's Top 40 single, "George Jackson", which peaked at #33 in January 1972 and appeared for two weeks on AT40. The offensive lyric in the song was, "He wouldn't take shit from no one." To rectify the problem, AT40 engineer Bill Hergonson edited the lyric, which was now heard as "He wouldn't take it from no one." A similar situation occurred again in July 1975, when The Isley Brothers' Fight the Power was in the Top 40, but in this case, the substitute version provided by the group's label was unsuitable, resorting to the engineer to substitute grunts and extra drum beats over the offending parts of the original record. However, this was not before AT40 erroneously played the uncensored version the first two weeks on the chart, on the July 12 and 19, 1975 editions.
Songs with offensive words in their titles were often censored for radio airplay, and is reflected in their inclusion on AT40. In 2011, three such songs have made it to the #1 position on AT40: "Fuck You" by CeeLo Green, "Fuckin' Perfect" by Pink, and "Tonight " by Enrique Iglesias. Other notable songs included "Niggas in Paris" by Jay-Z & Kanye West, "Ass Back Home" by Gym Class Heroes, "I Don't Fuck With You" by Big Sean featuring E-40, "Fuck U Betta" by Neon Hitch.
In 2000, "Sexual " by Amber and "The Bad Touch" by Bloodhound Gang debuted on AT40 without any censorship despite both songs' context referring to sexual activity. The songs peaked at #25 and #21 respectively. That same year, the show also used a slightly suggestive version of soulDecision's "Faded", despite a more radio-friendly version of the song being available.
In 2015, The Chainsmokers's "Roses", Travis Scott's "Antidote", Halsey's "New Americana", and Alessia Cara's "Here" had been edited by censoring one of their chorus in the lyrics dealt with prohibited drugs. In 2018, Khalid's "Young Dumb & Broke" was similarly censored, with the lyric "I'm so high at the moment" being completely edited out of the song due to references to drugs. However, on some versions of the show, the lyric was not censored.
In 2017, Jason Derulo's "Swalla" also had its chorus heavily censored due to the context of the title referring to oral sex. However, the title of the song was announced without being censored, presumably due to the fact that Ty Dolla $ign uses the title lyric to refer to drinking during his verse in the song.
In 2018, N.E.R.D and Rihanna's "Lemon" was significantly edited. An alternate version of the song was played, which had the final two verses of the song played on loop. This is presumably to remove the first two verses, in which the lyrics included highly charged political issues such as immigration, racism and anti-Donald Trump sentiments.
In 2019, the chorus of Fletcher's "Undrunk" was edited due to lyrics about masturbation.

Unannounced titles

Although Kasem never banned a song from the countdown, there was at least one instance in which both Kasem and his guest host, Charlie Van Dyke, refused to announce the title of a song on his show. When George Michael's "I Want Your Sex" hit the Billboard charts in the summer of 1987, Kasem and Van Dyke refused to announce the name of the song; only its artist. Also, as had been done with previous controversial hits, because of the song's suggestiveness, the show's structure was altered slightly, so stations could opt out of the song. This pattern was also evident during the 1987 Year End countdown. The song title was mentioned five times during its chart run, during the week-ending episode of September 26, 1987, when it dropped out of the Top 40, and during the Top 100 of 1987 show; Shadoe Stevens, his successor, however did mention the title on the show from July 31, 1993, as part of the Flashback feature, as it was in the top 5 from that week in 1987. In the spring of 1991, when "People Are Still Having Sex" by LaTour and "I Wanna Sex You Up" by Color Me Badd debuted the same week, their titles were announced in full.
Another song that had its title unannounced after its first week was "Me So Horny" by 2 Live Crew, in the fall of 1989. It was mentioned twice at the beginning of the song, and back announced once, its debut week. For the rest of its chart run, the title was never again mentioned. When 2 Live Crew returned to the top 40 in the Summer of 1990, with "Banned in the U.S.A.", Shadoe did mention that it was the follow-up to "Me So Horny". The song did come with edit out instructions for stations as well. Other songs around that time with edit out warnings were "The Humpty Dance" by The Digital Underground, and "Tic Tac Toe" by Kyper.
In 2018, "God is a Woman" by Ariana Grande had its title not mentioned and its chorus edited in some airings of the show in some Middle Eastern countries, presumably due to religious beliefs; despite this some radio stations such as Hi FM in Oman play the song in its entirety during normal programming.

Lengthy songs and double-sided hits

Very rarely was a song on that week's chart excluded from that week's AT40, if so only due to time considerations—on an edition that aired the weekend of December 19, 1970, The Guess Who's "Share the Land", which ranked at #30 that week, was omitted from AT40, in order to play both sides of that week's #1 Double A-side hit, George Harrison's "My Sweet Lord" / "Isn't It a Pity". Normally when a Double A-side appears on the charts, one side is played one week, with the other played the next week, alternating each week as long as it was in the Top 40. Similar omissions occurred in February 1974 when both the Gordon Sinclair and Byron MacGregor versions of The Americans simultaneously hit the Top 40; in each case, only one version was played each week alternately.
Don McLean's 1971 hit American Pie, which was 8:33 long, was split into two segments for the single release. When the song aired on AT40, each part was played alternately, with the entire song played when it reached #1.
In early 2013, Justin Timberlake's single "Mirrors" had to be edited for time, as the song is over eight minutes long.

Remixes and alternate versions of charted songs

On several occasions, the show would play remixed versions of charted songs. Notable examples included Enya's "Only Time", LeAnn Rimes' "Can't Fight the Moonlight", Mikaila's "So
In Love With Two", Whitney Houston's "It's Not Right but It's Okay" and "My Love Is Your Love" among others.
In 2001 and 2002, AT40 played the original versions of Joe's "Stutter", Jennifer Lopez's "I'm Real" and Samantha Mumba's "Baby Come on Over", in which airplay was given for remixed versions of each song.
In 2019, AT40 played the original version of Lil Nas X’s “Old Town Road”, despite the remix version with Billy Ray Cyrus receiving airplay.

Disco and rap

As has been mentioned previously, many rock radio stations in the late 1970s adopted anti-disco stances, and this, too, was reflected in the way some affiliates edited AT40. For example, one 1979 show featured a story about disco saving New York; again, the show was structured so that anti-disco stations could edit the story out of the show.
More famously, on the weekend of July 7–8, 1979, Cleveland, Ohio AT40 affiliate WGCL, instead of carrying the "American Top 40 Top 40 Disco Songs" special because of being an anti-disco radio station, did its own version of American Top 40 using the July 7, 1979 Billboard chart as the source with Townsend Coleman handling the hosting duties for Casey Kasem. The special Cleveland-only American Top 40 episode did not feature the AT40 Archives, extras, or Long Distance Dedications – just the top 40 singles of that week, which was preceded by a recap of the previous week's top three. Because the station did not have disco songs in the playlist, and the top 40 that week had several disco songs, WGCL had to reach outside its library to find copies of some of the songs, some of which were not the single versions; "Hot Stuff" and "Bad Girls" by Donna Summer, the songs occupying the #3 and #2 spots on the Billboard chart for that week respectively, were conveniently available as a 12-inch medley, which Coleman used for the show. Through clever editing, Coleman also took the "Casey's Coast to Coast" jingle and spliced in a "T," to provide an appropriate "TC's Coast to Coast" jingle. Kasem himself did not learn about the deception until 1996, laughing the whole thing off by saying, "Maybe I don't want to hear it!"
Coleman's sleight-of-hand was actually the second time a version of the AT40 had aired that was not quite on the up and up. According to Rob Durkee's book "American Top 40: The Countdown of the Century", Dave Morgan of WDHF in Chicago ghosted an edition of the program sometime in the summer of 1975. When the station's copy of the show did not arrive in time, he used Billboards list and merely played the records, apparently heavily implying that the show was American Top 40 without actually identifying it as such. "My program director made me do it!" Morgan said years later. The following year, WDHF would refuse to play AT40's "Fourth of July's Greatest Hits" special, due to the special's overabundance of #1 hits from the pre-rock era. But while the special was a stark departure from the contemporary sound of the 1970s, Tom Rounds in his press release reminded stations that it was the United States' "one and only bicentennial."
From 1992 to 1994, two radio stations still carrying American Top 40 had to carry customized versions of the show. WPLJ in New York City aired the show with the urban/dance/rap songs mentioned but not played and were replaced here and there by Hot Adult Contemporary-leaning extras. KUBE in Seattle, Washington, aired AT40 with a few songs that did not fit the station's Top 40 Rhythm format omitted each week. It has also been reported that WSTR in Atlanta, Georgia, being an anti-rap station and a very Adult Contemporary-leaning CHR, edited "Another Night" by Real McCoy out of its broadcasts of Casey's Top 40 in 1994, even while the song was at #1 on the show.

Special Countdowns

Occasionally American Top 40 airs special countdowns in place of the regular American Top 40 countdown show. These included1:
The top songs of the year are counted down near the turning of each year, though the format has varied over the years.
During the show's original run, the 2-week Top 100 programs came with special instructions for editing the show into one 8-hour block. Conversely, the 1-week Top 100 programs came with instructions to split the show into two 4-hour blocks.
In 1971 and 1973, only the top 40 was counted down due to AT40's Top 40 Christmas Countdowns which aired the week prior. The show did not air Christmas countdowns again until the spinoff shows "American Top 20" and "American Top 10" came into existence, as both of these spinoffs aired a "Top 60 Christmas Songs" special annually the two weeks immediately preceding Christmas.
In 1994, the show was no longer airing in the US, and would be put on hiatus a month later.
Since 2010, the show has aired the same Top 40 year-end chart two weeks in a row, with the only differences being the optional AT40 Extras and re-cut announcements mentioning the Dick Clark's New Year's Rockin' Eve as a past event instead of an upcoming event. An exception to this was in 2019 when the year-end chart was aired only on the weekend before Christmas, due to the decade-end chart airing the following weekend, with the normal chart resuming the first weekend of January.

Decade-End Countdowns

In 1979, 1999, 2009 and 2019, the show aired special countdowns of the decade's biggest hits. In 1979 and 1999, the annual year-end countdown show was cut to one week to accommodate the special countdown, though in 2009, they aired a third special week after their usual two-week Top 100. The decade-end shows counted down the Top 50 of the 1970s, and the Top 40s of the 1990s, 2000s, and 2010s. There was no decade-end countdown for the 1980s.

Substitute hosts

Over 50 celebrities—among them radio personalities, game show hosts, and charting artists—have substituted for these three throughout the show's run. Radio announcer Charlie Van Dyke filled in for Casey a record 31 times in the 1980s.
Substitutes for Ryan Seacrest have included:
Some well-known guest hosts for Casey Kasem have included:
Los Angeles deejay "Emperor" Bob Hudson attempted to substitute for Casey sometime between 1976 and 1978 ; however, Hudson had trouble recording his material for AT40, giving up after realizing that he could not host AT40 the same way he would host his morning drive show. As a result, Casey cancelled his vacation and returned to Los Angeles to record that week's AT40, but made sure that Hudson, a legendary disk jockey and comedian, got paid for his work anyway.
Guest hosts for Shadoe Stevens included:
1 The week Jay Thomas hosted, October 31, 1992, Chris Cox of KEZY in Anaheim, California taped a special version for that station at Watermark's studios, because of contractual stipulations that prohibit talent from Los Angeles-based stations from being heard on KEZY.

Syndication

Modern countdown

Stations located in the USA can be found on
StationMarketFrequencyAirtime
KTKN-AMKetchikan, AK930 AM
97.5 FM		Su 8 PM-12 AM
WKEE-FMHuntington, WV100.5 FMSu 8 AM-12 PM
WVOH-FMDouglass, GA93.5 FMSa 12-4 PM
TNL RadioSri Lanka99.2 FM
101.8 FM		Sa 6-10 AM
Su 8 AM-12 PM
CFBT-FMVancouver, Canada99.9 FM
Love FMPhnom Penh, Cambodia97.5 FMSa 9 AM-1 PM
Su 8 PM-12 AM
El Lobo 106Chihuahua, Mexico106.1Sa 6-10 PM
Mo 9 PM-1 AM
Antena 8Panama City, Panama100.8Sa 12-4 PM
Kool 104Telangaana, India104 FMFri 9 PM-1 AM
Sa 6-10 PM
Nile FMCairo, Egypt104.2 FMFri 3-7 PM
Wed 9 PM-1 AM
Radio OneMumbai
Delhi		94.3 FM
XFMKampala, Uganda94.8 FMSa 10 AM-2 PM
Su 9 PM-1 AM
Hit FMChina88.5 FM
88.7 FM
87.9 FM 		Sa 8 AM-12 PM
Su 8 PM-12 AM
Soundcity Radio NetworkNigeria98.5 FM
96.3 FM 		Sa 6-8 PM
Su 6-8 PM
Amber Sound FMDerby, UK107.2 FMSu 1-5 PM
KKBT-FMPago Pago, AS104.7 FMSu 6-10 AM
Su 8 PM-12 AM
D99Monterrey, Mexico98.9 FMSa 12-4 PM
Black Star RadioQueensland, Australia99.7 FM
105.3 FM
107.7 FM
91.9 FM
106.1 FM
107.7 FM
96.7 FM 		Sa 12-4 PM
96NAU FMPapua New Guinea96.5 FM
Prambors FMJakarta, Indonesia102.2 FMSa 6-10 PM
Su 6-10 AM
Hi FMOman95.9 FM
95.7 FM
87.8 FM 		Thu 1-5 PM
Sa 4-8 PM
Virgin Radio DubaiDubai, UAE104.4 FMSa 8 AM-12 PM
K FMVictoria, Seychelles97.2 FMSu 10 AM-2 PM
Kiss92 FMSingapore92 FMSu 8 AM-12 PM
Kristal FMBrunei90.7 FM
98.7 FM 		Sa 1:30-5:30 PM
Mega 102.1Georgetown, Guyana102.1 FMSu 10 AM-2 PM
Radio IndigoGoa, Inida91.9 FMSa 3-7 PM
Radio WestUganda100.2 FM
91 FM
94.3 FM 		Sa 9 AM-1 PM
FM96Fiji96.2 FM
96.4 		Su 6-10 PM
Sirius XM Channel 11
North AmericaDigital/Satellite RadioSa 6-10 AM PDT
Su 8 AM-12 PM PDT
AFN-Today's Best HitsUS Armed ForcesDigital/Satellite Radio
Sa 2-6 PM CET & JKT

"Classic American Top 40"

More than 200 stations air archived versions of AT40 from the 1970s and 1980s. Major markets that carry the archived version include iHeart 80's FM in San Francisco, KKLZ in Las Vegas, 105.9 Sunny FM in Orlando, 95.7 The Jet in Seattle, and KONO 101 in San Antonio. Some cities air Kasem in two different stations, such as Detroit and New Orleans, normally because one airs the 70s version while the other airs the 80s version. The show airs internationally in the following cities
Aruba
Mozambique
India
Australia
Germany
American Forces Network
Canada
United Kingdom
Mexico
Russia
Internet
, The Weeknd's Blinding Lights became the second. The others were "Another Night" by Real McCoy and "On Bended Knee" by Boyz II Men in 1994 and 1995 respectfully.