Sonata for 2 Pianos in D major, K. 375a/448

The Sonata for Two Pianos in D major, K. 448 (375a), is a work composed by Wolfgang Amadeus Mozart in 1781, when he was 25. It is written in sonata-allegro form, with three movements. The sonata was composed for a performance he gave with fellow pianist Josepha Auernhammer. He also performed the sonata in concert in June 1784 with Maria Anna Barbara von Ployer, an accomplished pianist for whom he composed two piano concertos (No. 14, K. 449, and No. 17, K. 453).

Mozart composed this work in the galant style, with interlocking melodies and simultaneous cadences. This is one of his few compositions written for two pianos – the others are the concerto for two pianos, K. 365, and the Fugue in C minor, K. 426, which Mozart later arranged for string quartet with an added introductory adagio.

The autograph manuscript of the sonata is preserved in Veste Coburg, Germany.