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
International Gilbert and Sullivan Festival Production" (for performers under 21) and a "Bus Pass Opera" production (for performers over 60). A "Unifest" competition among university groups is presented simultaneously, as part of the Festival fringe. While the amateur productions compete during weeknights at the Festival, there are weekend professional performances given by companies such as the Carl Rosa Opera Company, Opera della Luna, the New York Gilbert and Sullivan Players, Charles Court Opera, and the Festival's self-produced National Gilbert & Sullivan Opera Company, which has starred such well-known G&S performers as Richard Suart, Simon Butteriss, Bruce Graham, Gillian Knight, Barry Clark, Michael Rayner, Patricia Leonard,