The musical 'CATS' is a popular stage show featuring the Jellicle Ball. It is based on T.S. Eliot's 'Old Possum's Book of Practical CATS' and tells the story of a tribe of CATS called the Jellicles who must decide which one of them will ascend to the Heaviside Layer and be reborn into a new life. The musical features a variety of songs, dances, and characters, and has been performed around the world since its debut in 1981.