The Music Animation Machine helps pianists visualize the counterpoint in Bach with videos showing each of the voices.
Johann Sebastian Bach
What Happened When I Read Reinventing Bach
For a train journey down south, Paul Elie took along a triple-CD set of Bach’s St. Matthew Passion.
Pulling Bach’s Music into 21st Century
I think the best definition of polyphony that I ever heard was from Arthur Jacobs, who defined it as “the simultaneous combination of two or more melodies to make musical sense.”