The Piano Sonata in E-flat major D 568 by Franz Schubert is a sonata for solo piano. It is a revision and completion of the Sonata in D-flat major D 567. The D-flat major version was composed in June 1817, while the E-flat major revision and completion, published in 1829 after Schubert's death as Op. posth. 122, dates from sometime around 1826.

Movements

• I. Allegro moderato in E-flat major

  The unconventional proportions of the exposition are not unusual in Schubert's compositions of the late 1820s. The complex of main theme (up to bar 28), very brief modulation into the dominant (bars 28-35 with confirmation of the B flat major reached 35-40) and secondary theme (41-56) only takes up about half of the exposition. After a further modulation with a final cadence in D flat major (56-63), a third theme in D flat major follows, which modulates to C minor and cadences down (63-71), followed by a repetition of this third theme, which modulates back to B flat major through an extension (71-88). B flat major is confirmed in a detailed appendix (88-112). The traditionally decisive events in the first half of the exposition are thus compressed together. D flat major and C minor, which dominate the subsequent sections, bear no logical relationship to the main key (the deeply altered VIth degree of B flat major, for example, would be typical). A typical example of this would be the low-altered 6th degree of G-flat major - related to B-flat major - which in a further step is transformed into a double dominant by the addition of an augmented sixth e).

  Schubert's exposition, on the other hand, is arranged more associatively. The foreign keys take up a disproportionate amount of space; instead of revealing their relationship to the home key through a brief turn, they have to be reached and left through comparatively cumbersome modulations. Such formal experiments, which dissolve the dramaturgical unity of the exposition, led to the assertion in the older Schubert literature that Schubert was unable to compose sonatas. In his later works, however, Schubert developed his own ideas of form. The Sonata in A major D 664 (op. 120), composed in 1819, begins with a compact exposition that dispenses with all detours.

• II. Andante molto in G minor

• III. Menuetto: Allegretto – Trio in E-flat major

• IV. Allegro moderato in E-flat major

This sonata is a transposition and elaboration of the Piano Sonata in D-flat, D. 567.

Daniel Coren summarized the nature of the recapitulation in the first movement of this sonata as "syncopated primary material"

Read more: https://en.wikipedia.org/wiki/Piano_Sonata_in_A_major,_D_664_(Schubert)