33 in E-flat major (K. 481) was composed by Wolfgang Amadeus Mozart in Vienna and listed in his personal catalogues of his works on December 12, 1785.
[1] The musicologist Marius Flothuis states that although much is unknown about the history of this sonata, it is certainly "one of the most mature works in Mozart's whole chamber output".
[1] Carl Friedrich Cramer in a 1783 review of this and Mozart's other mature piano and violin sonatas praised the style of composing for instruments in a democratic manner, fitting for the style, requiring skill and talent of both instrumentalists.
Furthermore, the development section is based on none of these three subjects, but on a four-note motif that would become the theme for the last movement of the Jupiter Symphony (Nº 41).
Simon Keefe calls attention to the equal partnership between piano and violin in presenting the main theme as well as later thematic material during the recapitulation section.