[1] The autograph manuscript of the sonata is preserved in the Morgan Library & Museum.

[2] The surviving manuscript was written using the same type of paper used for the Symphony No.

[3] The sonata is a rare minor key composition in Mozart's catalogue.

21 in E minor, K. 304/300c, it has been suggested that the sudden death of Mozart's mother may have led to the more sombre mood found in these pieces.

[4] The composition, which typically takes around 22 minutes to perform, is in three movements: This article about a sonata is a stub.