William Kinderman's book about this work traces its compositional history and identifies late sketches for it in the Engel- mann Sketchbook. An Allegro fugue in this composition abandons its usual key and is instead in E-flat, though it modulates back to the main key after a cadenza-like passage consisting of a rising and falling sixteenth-note arpeggiation of a diminished seventh chord. Another section of this work parodies an aria for Leporello in Don Giovanni. The composer put his Missa Solem- nis on hold to begin work on this composition, despite having originally insulted its thematic material as a "cobbler's patch." This work appears in part I of the collaborative publication Vaterländischer Künstlerverein. For 10 points, name this piano composition, Beethoven's Opus 120, consistin
William Kinderman's book about this work traces its compositional history and identifies late sketches for it in the Engel- mann Sketchbook. An Allegro fugue in this composition abandons its usual key and is instead in E-flat, though it modulates back to the main key after a cadenza-like passage consisting of a rising and falling sixteenth-note arpeggiation of a diminished seventh chord. Another section of this work parodies an aria for Leporello in Don Giovanni. The composer put his Missa Solem- nis on hold to begin work on this composition, despite having originally insulted its thematic material as a "cobbler's patch." This work appears in part I of the collaborative publication Vaterländischer Künstlerverein. For 10 points, name this piano composition, Beethoven's Opus 120, consisting of a set of variations on a waltz originally produced by an Austrian musician.