Andrew Lloyd Webber's Cats, the first megamusical, opened at the New London Theatre.

Andrew Lloyd Webber, Baron Lloyd-Webber is an English composer and impresario of musical theatre. Several of his musicals have run for more than a decade both in the West End and on Broadway. He has composed 21 musicals, a song cycle, a set of variations, two film scores, and a Latin Requiem Mass.

Cats is a sung-through musical with music by Andrew Lloyd Webber. It is based on the 1939 poetry collection 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 the "Jellicle choice" by deciding which cat will ascend to the Heaviside Layer and come back to a new life. As of 2024, Cats remains the fifth-longest-running Broadway show and the eighth-longest-running West End show.

A megamusical is a large-scale musical produced for large commercial profit. Such musicals utilize spectacle and increased technology to "radicalize the imagistic potential of musical theatre." Early concepts of the megamusical came into existence in the 1970s, and the form was established and popularized in the 1980s by individuals such as Andrew Lloyd Webber and Cameron Mackintosh. Megamusical is analogous to the film industry term "blockbuster".

The Gillian Lynne Theatre is a West End theatre located on the corner of Drury Lane and Parker Street in Covent Garden in the London Borough of Camden. The Winter Garden Theatre occupied the site until 1965. On 1 May 2018, the theatre was officially renamed the Gillian Lynne Theatre in honour of choreographer Gillian Lynne. It is the first theatre in the West End of London to be named after a non-royal woman.