J.S. Bach and blurred tonality (learning the three-part Invention or Sinfonia in F minor, BWV 795)

The Sinfonia in F minor is a tour de force work of art, perhaps evocative of the composer's Musical Offering in its strikingly atonal sections. Yet there are definitive cadences in Major and minor keys that occur at the terminus of tonally ambiguous tunnels. Bach wrote a preface to the two and THREE Part Inventions…