Beethoven’s Sonata No. 4 in E-flat major opens with an Allegro molto e con brio driven by repeated eighth notes, ringing chords, and quick changes of register. Its broad first movement moves between energetic keyboard passages and quieter melodic ideas. Scales, broken chords, and sharply accented exchanges keep the music active even when the texture becomes lighter.

Measures 1–10 establish the repeated-note pulse in the left hand while the right hand moves from short chords into a rising and falling melodic line. Around measures 25–40, brief chordal gestures separated by rests give way to more continuous running notes. The hands then share the moving material across contrasting registers.

Around measures 59–75, a quieter chordal idea introduces longer notes and a more measured pace of harmonic change. The texture gradually fills out again. Repeated chords, quick scales, and broken figures build toward the exposition’s printed repeat.

Around measures 140–170, the music reworks familiar running figures and chordal gestures in changing registers and harmonies. Forceful accents alternate with soft phrases. After a thinning of the texture and short pauses, the opening repeated-note idea returns around measure 189, followed by the movement’s contrasting material.

The closing stretch, including measures 313–350, continues to develop short chordal gestures over the persistent eighth-note pulse. Quiet passages and sudden strong responses delay the final arrival. The last page gathers these repeated notes and accented chords into a firm, emphatic close.

Interesting fact: The movement’s energetic pulse is written in 6/8, with two groups of three eighth notes in each measure.