He began dancing at the age of three and was trained in Tap, Jazz, Ballet, Street and Contemporary at Eleanor's School of the Dance. Snide has competed in dance competitions across the United States and won many titles and awards in the category of 13 and under. He represented the United States in the World Competition 10 and Under in Riesa, Germany in Tap and Show Dance and won the Gold Medal in both areas for his age category of 13 and under. He has also won the Mini and Junior Outstanding Dancer Award from the New York City Dance Alliance. In 2007 after successfully auditioning in the US for the title role of Billy in Billy Elliot the Musical he was sent to the UK to begin training for the London West End production and first performed on May 16, 2007 in the Victoria Palace Theatre. He continued to perform in London until November 2007 when he was temporally transferred to the Sydney production to replace an injured Nick Twiney. His first performance in Sydney was on December 8, 2007 and he continued to perform until January 19, 2008 after which he returned to the London production. After a period of retraining for the London version of the show he completed two performances in London before further injuries to the Australian cast, this time to Lochlan Denholm, prompted his return to Sydney on February 27, 2008. In March 2008 he returned again to London to resume performances there. Corey's final performance as Billy was in London on July 5, 2008, after which he returned home to Albany, NY. Snide got a small part in a pilot for Cupid. Snide played the understudy/alternate for the lead role of "Evan" in the Broadway musical show 13. He usually played the role during the weekend matinees. In February 2010, Snide reprised his role of Evan in a production of "13 The Musical" with Capital Area Productions in NY. In July 2010, Corey Snide's winning tap dance performance at the 2010 NYCDA Nationals scored him a four year college scholarship to Marymount Manhattan College. In March 2011, Snide was accepted into Juilliard, from which he graduated in 2015. In July 2016, Snide started playing the understudy/alternate for the roles of "Coricopat" and "Mistoffelees" in the Broadway revival of the musical show Cats. In middle school, he was in a few school plays including one with students such as Jill Lambert.
