Wolfgang Amadeus Mozart's Piano Sonata No. 15 in F major, KV 533/494 was finished in 1788. It is a work in three movements, and a typical performance lasts about 23 minutes. The third movement, a Rondo in F major, was originally a stand-alone piece composed by Mozart in 1786 (K. 494 in the Köchel catalogue). In 1788, Mozart wrote the first two movements of K. 533 and incorporated a revised version of K. 494 as the finale, having lengthened it in order to provide a more substantial counterpart to the other two movements.