classrooms 1721 compositions Compositions in F major Compositions in G major Compositions in D major Compositions in B-flat major Compositions for trumpet Compositions for viola Compositions for horn Compositions for bassoon Compositions for cello Compositions for flute Compositions for oboe Concerti grossi Concertos by Johann Sebastian Bach Harpsichord concertos Bach Köthen (Anhalt) Contents of the Voyager Golden Record Concertos for multiple instruments