Listen to Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: I. Allegro online. Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: I. Allegro is an Instrumental language song and is sung by Igor Oistrakh and Moscow Philharmonic Chamber Orchestra. Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: I. Allegro, from the album Bach: Brandenburg Concertos, was released in the year 2008. The duration of the song is 6:35. Download Instrumental songs online from JioSaavn.