The first movement of Beethoven’s Sonata No. 21, Op. 53, opens with quiet repeated chords and quickly expands into a large, energetic Allegro con brio. Rapid scales, changing registers, and continuous sixteenth notes alternate with a broad chordal theme. The opening material returns in different harmonies before a substantial closing section brings together the movement’s restless motion and its quieter, sustained writing.

Opening and contrasting theme: Repeated intervals in the right hand and low octaves in the left establish a light, insistent pulse. Short melodic figures emerge above this pattern, followed by sudden leaps and descending runs. A held chord with a fermata interrupts the motion before fast broken figures spread between the hands. The contrasting theme arrives in E major at a slightly slower marked pace. Its connected chords lead into upper triplets over held lower harmonies. As the tempo gathers speed again, the hands exchange shorter moving figures and return to sixteenth-note passagework.

Exposition and development: Repeated upper notes, offbeat lower chords, and long descending runs build the exposition’s closing section. A sustained left-hand trill supports an active upper part before quieter chords and first and second endings complete the repeat route. The development brings back the opening gesture in new harmonies. Short lines appear in changing registers over fast lower broken chords. Later, the right hand takes over the running sixteenths while the left supplies held harmonies and middle-register responses. Strong surges gradually diminish into a quieter passage with low oscillating notes.

Return and extended ending: The opening repeated chords reappear softly, followed by familiar melodic fragments and more forceful runs. Fermata chords and additional quiet flourishes interrupt the return. The smoother chordal theme also comes back in changed harmony, followed by triplet figures and an increase in pace. The closing section revisits the opening rhythm, sends scales between the hands, and then briefly recalls the broad chordal theme in a tranquil texture. A final return of the repeated chords leads to quick runs and three forceful closing chords.

Interesting fact: In the development, this edition labels several short figures with woodwind comparisons: bassoon, flute, clarinet, and oboe. These labels highlight the contrasting registers and voices within the piano texture.