I picked up on this from the Open Culture Twitter stream. It’s a wonderful illustration of the really crunchy intellectual satisfaction that Bach’s counterpoint provides.

Don’t walk away from this thinking that Bach is exclusively a cerebral composer—his music is also moody and dramatic in the swirling opening of the St. John Passion BWV 245:

…and joyously uplifting in the Prélude to the sixth Cello Suite BWV 1012: