Listen to Piano Sonata No. 20 in A Major, D. 959: I. Allegro online. Piano Sonata No. 20 in A Major, D. 959: I. Allegro is an Instrumental language song and is sung by Elisabeth Leonskaja. Piano Sonata No. 20 in A Major, D. 959: I. Allegro, from the album Schubert: Sonata No. 20, Allegretto in C Minor, Impromtu in A-Flat Major, was released in the year 1972. The duration of the song is 11:48. Download Instrumental songs online from JioSaavn.