Piano Sonata in G major, D894 / Piano Sonata in A major, D664 / Piano Sonata fragment, D769a

Piano Sonatas D.894 (G major), D.664 (A major) and the fragment D.769A are solo piano works by Franz Schubert, composed between 1819 and 1826. They showcase Schubert's lyrical melodic writing, expanded harmonic language and formal experimentation that helped bridge Classical structures and emerging Romantic expressive aims, marking important developments in his piano output and early 19th-century piano literature.