(First Movement) B-flat major, Alla breve, Sonata form

[Exposition]

The main theme, consisting of a resolute motif of chords spanning over four octaves and a contrasting cantabile-like motif, expands its range to five octaves. After a theme statement where forte and piano alternate bar by bar, and a transition developing the opening motif, the subordinate theme is presented in G major, a minor third below. From this theme, successive musical ideas are spun out, and another subordinate theme appears in G major, accompanied by triplets and long trills. This theme leads into the codetta.

[Development + Recapitulation]

As the codetta motif is repeated and modulates, reaching E-flat major, a four-voice fugato based on the main theme's motif is developed. This is then broken down into the rhythmic material (eighth note + quarter note) that constitutes the motif.

The development of this material connects to the figuration from the exposition's transition, and the subordinate theme's material is developed in B minor, but quickly leads to the main theme's rhythmic motif. The tonality shifts to B major, and the repetition of this motif leads to the recapitulation of the main theme.

In the recapitulation, elements developed in the fugato are contrapuntally combined with the main theme. The cantabile-like melody is also subjected to intricate contrapuntal manipulation.

Both subordinate themes are recapitulated in the tonic key of B-flat major.

[Coda]

The codetta motif from the exposition is extended, and after the appearance of first the second subordinate theme, then the first subordinate theme, fragments of the main theme are repeated with a wide range of dynamics. The dynamic alternation between forte and piano gradually becomes more urgent, reaching an alternation on a beat-by-beat basis, then fades away into pianissimo.

This sonata-form movement concludes with a thorough, fragmentary treatment of the main theme's motif.