Gilbert and Sullivan of these recordings have been reissued on CD. After the company was revived in 1988, it recorded seven of the operas. After the copyrights on the operas expired, numerous companies around the world released popular audio and video recordings of the operas. In 1966 and again in the 1980s, BBC Radio presented complete cycles of the thirteen extant Gilbert and Sullivan operas, with dialogue. Ad hoc casts of operatic singers conducted by Sir Malcolm Sargent in the 1950s and 60s and Sir Charles Mackerras in the 1990s have made audio sets of several Savoy operas, and in the 1980s Alexander
Gilbert and Sullivan de Corneville"). Hundreds of unauthorised, or "pirated", productions of "Pinafore" appeared in America. During the run of "Pinafore", Richard D'Oyly Carte split up with his former investors. The disgruntled former partners, who had invested in the production with no return, staged a public fracas, sending a group of thugs to seize the scenery during a performance. Stagehands successfully managed to ward off their backstage attackers. This event cleared the way for Carte, Gilbert and Sullivan to form the D'Oyly Carte Opera Company, which then produced all of their succeeding operas. The libretto of "H.M.S. Pinafore" relied on stock character types,