Peter Ustinov's One Man Imitation Mozart

People who saw this act live said it was one of the funniest things in the history of comedy, musical or otherwise (as was just about everything else Ustinov did). But that being said, this sounds much more impressive than funny. Peter Ustinov doing an almost pitch-perfect multi-track mock-Mozart singing, mock-Mozart orchestration, mock-Italian lyrics, mock-Deutsche Rundfunk announcer. Besides, it's followed by a Russian folk song called "depressing love song of the Peasant whose tractor has betrayed him." How can this be anything but awesome?