The first movement of Mozart's second clarinet quintet-Mozart's Sonata Allegro For Clarinet And String Quartet is certainly an exciting addition to the Clarinet repertoire. The first movement of Mozart's projected Second Clarinet Quintet the 'fragment' that is the basis of this work had been known about for many years and was always considered a trial run for the great K581; however recent dating has shown the two pages of manuscript date from after the Clarinet Quintet.The distinguished Mozart scholar Timothy Jones has proved this to be the beginning of a response to the popularity of K581. It was only as a result of his early death that the workremained incomplete. Jones has completed the work using his deep knowledge of late Mozart and we have now a very important new addition to the Clarinet Quintet repertoire.