Cats is a musical composed by Andrew Lloyd Webber, based on Old Possum's Book of Practical Cats by T. S. Eliot. The musical 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 also introduced the song standard "Memory".

Directed by Trevor Nunn and choreographed by Gillian Lynne, Cats first opened in the West End in 1981 and then with the same creative team on Broadway in 1982. It won numerous awards, including Best Musical at both the Laurence Olivier Awards and the Tony Awards. The London production ran for twenty-one years and the Broadway production ran for eighteen years, both setting new records. Actresses Elaine Paige and Betty Buckley became particularly associated with the musical.