For 10 points, name this composer of the Jupiter Symphony who died before he could finish his 1791 Requiem.
This composer used an A-flat larghetto in 3/8 time as the second movement of the later of his two piano quartets, while a piece named "Sleigh Ride" ends his Three German Dances. His cantata Davide Penitente reused music from the Kyrie and Gloria sections of his unfinished Great Mass in C minor. He omitted repeat signs from the exposition in the first movement of a symphony that he constructed by dropping the introductory march and a minuet from a serenade composed for Sigmund (*) Haffner. The finale of another of his symphonies opens with the four-note theme C-D-F-E and ends with a five-voice fugato representing the five major themes. Franz Xaver Süssmayr completed the last entry in the Köchel catalog of this man's works. For 10 points, name this composer of the Jupiter Symphony who died before he could finish his 1791 Requiem.
This composer used an A-flat larghetto in 3/8 time as the second movement of the later of his two piano quartets, while a piece named "Sleigh Ride" ends his Three German Dances.
Wolfgang Amadeus Mozart