The Piano Sonata No. 16 in C major, K. 545, by Wolfgang Amadeus Mozart was described by Mozart himself in his own thematic catalogue as “for beginners”, and it is sometimes known by the nickname Sonata facile or Sonata semplice.[1]

Mozart added the work to his catalogue on June 26, 1788, the same date as his Symphony No. 39. The exact circumstances of the work’s composition are not known, however. Although the piece is well-known today, it was not published in Mozart’s lifetime and first appeared in print in 1805. A typical performance takes about 14 minutes.

The second movement is in the key of G major, the dominant key of C major. The music modulates to the dominant key of D major, and then back to G major in which the exposition is heard again. For the development, the music modulates to G minor, then B♭ major, then C minor, then G minor and finally back to G major, at which point the recapitulation occurs followed by a short coda.