H.M.S. Pinafore; or, The Lass That Loved a Sailor is a comic two-act opera and the fourth opera collaboration between composer Arthur Sullivan and librettist W. S. Gilbert. Lampooning British social class, the Royal Navy, and unqualified people who rise to positions of authority, the work became an international sensation following the London premiere at the Opera Comique on May 25, 1878, becoming the second-longest running musical theater work up until that time. This new edition has been completed by Carl Simpson and Ephraim Hammett Jones. Instrumentation: 2.1.2.1: 2.2.2.0: Timp.Perc(1): Str (4-4-3-3-3 in set): Vocal soli (9 roles, SAATTBBBB): Chorus.