Cats is a musical composed by Andrew Lloyd Webber, based on Old Possum's Book of Practical Cats by T. S. Eliot. It introduced the song standard "Memory". Cats first opened in the West End in 1981 and then on Broadway in 1982, each time directed by Trevor Nunn and choreographed by Gillian Lynne; it won numerous awards, including both the Laurence Olivier Award and the Tony Award for Best Musical. The London production ran for twenty-one years and the Broadway production ran for 18 years, both setting long-run records.

The show tells the story of a tribe of cats called the Jellicles and the night they make what is known as "the Jellicle choice" and decide which cat will ascend to the Heaviside Layer and come back to a new life.Cats is the second longest-running show in Broadway history, and the fourth longest-running West End musical. It has been performed around the world many times and has been translated into more than 20 languages. In 1998 Cats was turned into a made-for-television film.