The two most tantalising losses for classical clarinettists are the autograph scores of Mozart's Concerto and Quintet, both supposedly lent by the composer to his friend Anton Stadler and subsequently lost. All surviving sources for clarinet misrepresent these pieces by adapting the solo part to the smaller ranger of the modern clarinet (Stadler's instrument had a basset extension to low C). One advantage of an adaptation of such works where the piano takes over the majority of the clarinet part...