His Majesty's Theatre is a West End theatre situated in the Haymarket in the City of Westminster, London. The building, designed by Charles J. Phipps, was constructed in 1897 for the actor-manager Herbert Beerbohm Tree, who established the Royal Academy of Dramatic Art (RADA) at the theatre. In the early decades of the 20th century Tree produced spectacular productions of Shakespeare and other classical works, and the theatre hosted premieres by such playwrights as Bernard Shaw, J. M. Synge and, later, Noël Coward and J. B. Priestley. Since the First World War the wide stage has made the theatre suitable for large-scale musical productions, and His Majesty's has accordingly specialised in hosting musicals. It has been home to record-setting musical theatre runs such as the First World War hit Chu Chin Chow and Andrew Lloyd Webber's The Phantom of the Opera, which has run at His Majesty's since 1986, except during the COVID-19 pandemic theatre closures.

Franz Joseph Haydn was an Austrian composer of the Classical period. He was instrumental in the development of chamber music such as the string quartet and piano trio. His contributions to musical form have led him to be called "Father of the Symphony" and "Father of the String quartet".