Composed in 1788. The well-known Piano Sonata in C major (K. 545) was also composed in this year. It is an Adagio in 4/4 time, written in B minor. It takes the form of a three-part (ternary) form, with the opening theme developed in G major in the middle section. The main theme is characterized by the left hand entering a half-measure later, with both hands proceeding in parallel motion. Throughout the piece, delicate note values are interspersed within the leisurely flow of the Adagio music.