Sonata form with an introduction. While the treatment of tonality is key in classical sonata form, the contrasting use of keys was intentionally avoided in this work. Consequently, the second theme appears in the same key even in the recapitulation. The pitch series of the first theme, 'A-B♭-G-F♯', is inverted in the second theme as 'B-B♭-C♯-D'. The entire work centers around the key of D, which is carried over into the third and fourth movements.