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 English language song and is sung by Vienna State Opera Orchestra. Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: I. Allegro, from the album Elegant Classical Music, was released in the year 2014. The duration of the song is 7:49. Download English songs online from JioSaavn.