Listen to String Quartet No. 6 in B-Flat Major, K. 159: II. Allegro online. String Quartet No. 6 in B-Flat Major, K. 159: II. Allegro is an English language song and is sung by First Baby Classical Collection. String Quartet No. 6 in B-Flat Major, K. 159: II. Allegro, from the album Smart Collection for Babies – Classical Music for Newborn & Older Children, Stimulate to Development, Einstein Effect, was released in the year 2017. The duration of the song is 3:18. Download English songs online from JioSaavn.