Piano Concerto no. 12 in A major, K. 414

Composed in Vienna in the autumn of 1782. 413–415 to be written although it was published second. The slow movement takes its theme from Johann Christian Bach, who had died that January and who had taught the eight-year-old Mozart in London; the borrowing reads as a memorial. The concerto can be played with string quartet instead of orchestra, part of Mozart's plan to sell the set to Viennese amateurs, and he left more than one set of cadenzas for it, so that performers may choose between his own alternatives.