Allegro in B flat for Clavier

Most modern editions of Mozart’s keyboard sonatas consist of the same 18 three-movement sonatas. However, at least three early sonatas are lost and only their incipits are known. The Sonata in F, KV 547a, which is closely related to the Violin Sonata in F, KV 547, only consists of 2 movements. In 1774–1775, Mozart composed a set of 6 sonatas, KV 279–284, which in the family were referred to as the “difficult sonatas”. All are in three movements and closely follow a model that Joseph Haydn had established with his so-called Esterházy sonatas, Hob. XVI:21–26. The next series of sonatas were published in groups of three (KV 309–311 and KV 330–332), while the sonatas composed from late 1783 onwards were written and published individually.