Franz Sussmayr completed this composer's Requiem Mass in D Minor.
Costanze sings "Martern aller Arten" in one of this man's operas, and Neptune punishes the title king of Crete in his Idomeneo. Anton Stadler was the dedicatee of his Clarinet Concerto in A Major, and he begins with unison D octaves in his Haffner(*) Symphony. Franz Sussmayr completed this composer's Requiem Mass in D Minor. This composer also wrote "Der Holle Rache" for the Queen of the Night in an opera about the rescue of her daughter Pamina by Tamino. For 10 points, name this composer of The Magic Flute and Eine Kleine Nachtmusik.
Costanze sings "Martern aller Arten" in one of this man's operas, and Neptune punishes the title king of Crete in his Idomeneo.
Wolfgang Amadeus {Mozart}