A bit of clever recycling resulted in the creation of the Concerto No 6 in F major, BWV1057. You can be forgiven if you don’t immediately recognize it as the Brandenburg Concerto No 4 in G major, BWV1049; the tunes will be familiar, but the scoring is not. The original concerto has two solo flutes, and they remain in this version, but the addition of a solo keyboard part (largely replacing the solo violin) is a novelty. It is not really a true solo concerto, as the keyboard shares the limelight with the flutes, but it nevertheless demands a very advanced technique, especially in the make-or-break outbursts of the finale. The slow movement, marked Andante, is a processional, making great use of echo effects between orchestra and keyboard. The finale shows how effortlessly Bach combined both fugal and concerto forms, with the opening entries of the subject followed by brilliant episodes for the three soloists. The joy and virtuosity that we find in the last movement of the Italian Concerto, BWV971 (also in F major) are much in evidence here.
from notes by Angela Hewitt © 2005