a half minutes long. III. Vivace The finale movement is the most playful and the shortest at barely two minutes long. The movement is constructed in rondo form (ABACA′ and a coda), with a two-part theme and contrasting episodes in key (B) and in rhythm (C). A very brief coda brings this quick, lighthearted sonata to a brisk end. Beethoven later uses the chord progression found at the beginning of the A section to start his Sonata No. 30. A comparison of the two pieces gives a dramatic illustration of how Beethoven's piano-writing developed in the 11 years that intervened between the two sonatas. The Op. 109 theme is altogether subtler and subject to dramatic twists that lead the listener into quite unexpected harmonic territory. References External links A lecture by András Schiff on Beethoven's piano sonata Op. 79 For a public domain recording of this sonata visit Musopen Recording by Paavali Jumppanen, piano from the Isabella Stewart Gardner Museum Piano Sonata 25 1809 compositions Compositions in G major