Low Notes on a High Level - J. B. Priestley

It is a gay frolic describing the difficulties that crop up when the "English Broadcasting Company" arrange to broadcast, for the first time, a terrific new symphony by a world-famous Scandinavian composer, who has stipulated a condition that the finale be provided by a Mr. Dobb, the inventor of a fantastic "musical" instrument, the Dobbophone, which he alone can play.