Piano Sonata in F, Episode 4

The development gets off to a dense start in C, then rumbles from the depths through c minor to the heights in E-flat with the more melodic second subject. A hint of fugue follows in A-flat, only to be interrupted by block chords in f minor. The motive from the first subject makes a brief appearance in A major, followed by an elongated bit from the end of the second subject in D major, which leads naturally to G major and C major, and finally the recapitulation starting in bar 141.