Impromptus, D 899 / Sonata, D 960

Impromptus, D.899 and the Piano Sonata in B-flat major, D.960 are solo piano works by Franz Schubert, composed in 1827 and 1828 respectively. They exemplify Schubert's late style, combining lyric, song-like melodies with expansive harmonic progressions and formal breadth; the impromptus present compact, contrasting character pieces while the sonata unfolds broad, introspective movements that deepen his exploration of sonata form in the final year of his life.