The Pirates of Penzance
The Pirates of Penzance; or, The Slave of Duty, is a comic opera in two acts, with music by Arthur Sullivan and libretto by W. S. Gilbert. It is one of the Savoy Operas. The opera's official premiere was at the Fifth Avenue Theatre in New York City on 31 December 1879, where the show was a hit with audiences and critics. The London premiere was on 3 April 1880, at the Opera Comique, where it ran for 363 performances, having already been playing successfully for over three months in New York.

Pirates remains popular today, taking its place along with The Mikado and H.M.S. Pinafore as one of the most frequently played Gilbert and Sullivan operas. Its 1981 Broadway revival by Joseph Papp ran for 787 performances, winning the Tony Award for Best Revival and the Drama Desk Award for Outstanding Musical, and spawned many imitations.