Sir Arthur Seymour Sullivan (May 13, 1842 – November 22, 1900) was an English composer best known for his operatic collaborations with librettist W. S. Gilbert. His artistic output included 23 operas, 13 orchestral works, 8 choral or oratorio works, 2 ballets, incidental music to several plays, and numerous hymns and other church pieces, songs, parlour ballads, part songs, carols, and piano and chamber pieces.