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Two other sonatas form the basis of Beethoven’s Opus 31. The second is the Piano Sonata in D minor, Op. 31/2, the Tempest Sonata. The first movement is in 2/2 and is marked allegro with interludes of largo, “quick” interspersed by “very, very slow.” Watch the right-over-left crossovers! He has only one subject in this exposition, and it leads into a development that is short and not so sweet, featuring a lot of crossovers. He recaps with his one subject and ends it quietly.

The second movement is in 3/4, B-flat, and is marked adagio, “at rest”. This movement has a hint of bel canto opera. He adds drum roll figures in the left and then the right hands. It has an air of improvisation.

The finale in D minor, 3/8 and marked allegretto is the heart of the sonata and the movement from which it gets its name. Having had a sonata movement at the beginning with only one subject, Lou writes a movement in full sonata format.
At 20:43, he begins his development and concentrates only on the first subject.
At 22:26, he recaps and brings his second subject back in D minor, which is what you would expect. He builds his coda from the first subject and ends quietly.

Beethoven: Piano Sonata in D minor, Op. 31/2