By Bad Seed
The first movement, in 2/2 time, is in Sonata form (typical for the first movement of a Sonata). The first theme is driven by a Mannheim Rocket, very similar to the opening of the first movement of Mozart's Symphony No. 25. The second theme, in A-flat major, is accompanied by eighth-note octaves in the bass (usually with dominant harmony). There are two codettas; the first consists of a series of energetic descending scales in A-flat major, and the second is a lyrical passage marked con espressione. In this second codetta and in the second theme Beethoven makes interesting use of mode mixture as the right hand parts borrows from the parallel minor. The development opens with the initial theme, but is mostly dedicated to the second theme and its eighth-note accompaniment. The retransition to the main theme uses its sixteenth-note triplet. The recapitulation repeats the material from the exposition without much change, except that it stays in F minor throughout. There is a short coda. A tense, agitated feel is ubiquitous throughout the movement. If played at speed, where one quarter note equals 126 to 138 macrobeats per minute, this movement can be challenging to perfect.