Listen to Sonata in B flat major, D. 960: 2. Andante sostenuto online. Sonata in B flat major, D. 960: 2. Andante sostenuto is an Unknown language song and is sung by Beautiful Pianists. Sonata in B flat major, D. 960: 2. Andante sostenuto, from the album Perfect Piano The 200 Best Piano Classics Part 1, was released in the year 2018. The duration of the song is 10:35. Download Unknown songs online from JioSaavn.