Concerto for Two Pianos in E-flat major, K. 365

Mozart wrote the Concerto for two pianos in Salzburg around 1779, almost certainly for himself and his sister Nannerl, the only partner with whom he had played in public since childhood. He took it to Vienna, performed it there in November 1781 with his pupil Josepha Auernhammer, and later added trumpets and timpani to the outer movements for the larger room. The two soloists exchange material continuously rather than compete; phrases begun by one keyboard are finished by the other, a division of labour that reflects the domestic music-making the piece came out of.