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 Columbia Strings Ensemble and Fritz Reiner. Brandenburg Concerto No. 6 in B Flat Major BWV 1051: I. Allegro, from the album Fritz Reiner Gold, was released in the year 2013. The duration of the song is 7:12. Download English songs online from JioSaavn.