The so-called 'French overture' BWV 831 along with the 'Italian concerto ' F major BWV 971 form the second part of the Clavier-Übung by Johann Sebastian Bach. To make the difference between the two styles as clear as possible Bach chose the tonality of B minor for the overture and transposed a clavier-suite in C minor, which had been written for connoisseurs only a few years before. The comparison between the two versions becomes particularly interesting in view of the fact that Bach changed man...