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 performing groups "support the culture of music and the drama. They are now accepted as useful training schools for the legitimate stage, and from the volunteer ranks have sprung many present-day favourites." Cellier and Bridgeman attributed the rise in quality and reputation of the amateur groups largely to "the popularity of, and infectious craze for performing, the Gilbert and Sullivan operas". The National Operatic and Dramatic Association (NODA) was founded in 1899. It reported, in 1914, that nearly 200 British troupes were performing Gilbert and Sullivan that year, constituting most of the amateur companies in the country (this figure included