Gilbert and Sullivan refers to the Victorian era partnership of librettist W. S. Gilbert (1836–1911) and composer Arthur Sullivan (1842–1900). The two men collaborated on fourteen comic operas between 1871 and 1896, of which H.M.S. Pinafore, The Pirates of Penzance and The Mikado are among the best known.
Frederic Emes Clay (3 August 1838 – 24 November 1889) was an English composer known principally for his music written for the stage. Clay, a great friend of Sir Arthur Sullivan's, wrote four comic operas with W. S. Gilbert and introduced the two men.