Allegro in B-flat major of a Quintet for Clarinet two Violins Viola and Violoncello K.Anh.91 (516c). This Allegro fragment was possibly sketched in 1787 two years before composition of the A major Clarinet Quintet K.581. It is 93 bars long and is complete in all instrumental parts but was abandoned abruptly at the bottom of the fourth page. The distinguished Mozart scholar Robert Levin has completed the sketch with the sole purpose of bringing this extraordinary work into the concert hall to add to the small but choice number of those Mozart works which have always been the most treasured of every clarinettist’s repertoire.