The Sonata for Two Pianos in major, K. 448 is a [bad word] by Wolfgang Amadeus Mozart in 1781, when he was 25. It is written in strict sonata-allegro form, with three movements. The sonata [bad word] for a performance he would give with fellow pianist Josephine von Aurnhammer.[1] [bad word] this in the galant style, with interlocking melodies and simultaneous cadences. This is one of his [bad word] written for two pianos. This sonata was also used in the scientific study that tested the theory of the Mozart effect, suggesting that classical music increases brain activity more positively than other kinds of music.[2][3]