Lee was a musical child prodigy. She won a scholarship and trained as a soprano for four years. Upon finishing her studies she became a vocalist with the top showbands playing prestigious Irish venues. Lee experienced similar success when she moved to London and joined the popular dance band; The Squadronaires. In 1955 her first solo record was released, followed by a further two the next year. From 1959 to 1964, Lee was a member of The Raindrops, a successful quartet who made countless appearances on British TV and variety shows, had a BBC Radio show and released a string of records, the majority of which had Lee as lead vocalist. The Raindrops also included Les Vandyke and Vince Hill in its line-up. In 1962, she entered the UK heats of the Eurovision Song Contest as a solo act with "There's No-one in the Whole Wide World" and performed it at the British national finals for BBC TV. This number was later covered and performed by The Beatles in concerts during this period. Lee decided to become a solo artist in 1965 and recorded 'beat' records until 1967. One of these releases, "Just Like a Man", reached the NME chart. The B-side; "I Gotta Be With You", became popular on the Northern soul circuit. Lee recorded this single under the name of 'Emma Rede' for EMI. Lee also had a parallel career as a respected session singer, through her groups The Jackie Lee Singers and Tears of Joy. She provided the backing vocals for such global number ones as "Green Green Grass of Home" by Tom Jones and "Release Me" by Englebert Humperdink. She demonstrated her unique vocal range, ability and versatility on such diverse recordings as "Hey Joe" by Jimi Hendrix; and much of the James Last catalogue at the time. At one point Elton John was employed by Lee, as a member of her session singers. In addition she also sang various songs for film soundtracks. Among them "Born To Lose" from the film Robbery, "Love Is Now" from the Norman J. Warren film Loving Feeling, and the title song to the horror filmGoodbye Gemini. In 1968, as 'Jacky', she had a UKTop Tenhit single with "White Horses", the theme from a children's TV programme. In 2003, her definitive version was voted the best TV theme tune of all time by The Penguin Television Companion. Her jazz-styled album of the same name was also released in 1968, which included contributions from Dudley Moore as pianist. By 1970, 'Jacky' reverted to 'Jackie Lee' and had another hit record; "Rupert" from the TV show based on the famous cartoon character, Rupert Bear. This recording also had a place in the "Best TV themes of all time" list from The Penguin Television Companion at Number 7, thus consolidating Lee's reputation. A tie-in album, "Jackie's Junior Choice", was released on Pye Records in 1971, followed by the similar, "Rupert and Other Junior Favourites" on Pye's budget Golden Guinea label in 1973, which also included Jackie's recording of another children's series, "Inigo Pipkin". It was shortly after this that she retired from singing, despite the short duration of her career, due to vocal complications and throat problems. Nonetheless, her singing continues to be held in high regard. It has been said that her work has "firmly embedded itself in the subconscious of a generation." A CD entitled End of a Rainbow – A Pye Anthology was released in 2007. It comprising all of Lee's later recordings, made for Pye Records between 1969 and 1973. A second CD, The Town I Live In collects all of her 1966/1967 recordings for EMI. Lee is now retired and resides in Canada. Her husband Liam passed away in 2018.