The . Piano Sonata No. 20 in A major D 959 wrote Franz Schubert in September of 1828 ; At first it was dedicated to Johann Nepomuk Hummel ; it only became known after the composer's death.
The sonata has four movements.
1815: E major (D 157) . 1816: Five Piano Pieces - Sonata in E major (D 459/459 A) . 1817: A flat major (D 557) | E minor (D 556) | F sharp minor (D 571) | D flat major / E flat major (D 568/567) | B major (D 575) | A minor (D 537) . 1819: A major (D 664) . 1823: A minor (D 784) . 1825: C major, relic (D 840) | A minor (D 845) | D major, Gasteiner (D 850) . 1826: G major (D 894) . 1828: C minor (D 958) | A major (D 959) | B flat major (D 960) .
