Listen to Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: II. Adagio ma non tanto online. Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: II. Adagio ma non tanto is an Instrumental language song and is sung by Leningrad Chamber Orchestra. Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: II. Adagio ma non tanto, from the album Bach: Brandenburg Concertos, was released in the year 1971. The duration of the song is 5:50. Download Instrumental songs online from JioSaavn.