Listen to Piano Sonata No. 17 in B Major, K. 570: III. Allegretto online. Piano Sonata No. 17 in B Major, K. 570: III. Allegretto is an English language song and is sung by Carmen Piazzini. Piano Sonata No. 17 in B Major, K. 570: III. Allegretto, from the album Classical Mozart 6, was released in the year 2018. The duration of the song is 3:28. Download English songs online from JioSaavn.