Listen to Keyboard Suite in B-Flat Major, BWV 821: I. Praeludium online. Keyboard Suite in B-Flat Major, BWV 821: I. Praeludium is an English language song and is sung by Zuzana Ruzickova. Keyboard Suite in B-Flat Major, BWV 821: I. Praeludium, from the album Bach: The Complete Keyboard Works, was released in the year 2016. The duration of the song is 1:04. Download English songs online from JioSaavn.