Listen to Keyboard Sonata in D Major, Fk. 3: I. Un poco allegro online. Keyboard Sonata in D Major, Fk. 3: I. Un poco allegro is an English language song and is sung by Anthony Spiri. Keyboard Sonata in D Major, Fk. 3: I. Un poco allegro, from the album W.F. Bach: 3 Fantasias, Fugues & Sonatas, was released in the year 2016. The duration of the song is 7:17. Download English songs online from JioSaavn.