Swing It, Johann. Bach Like You've Never Heard It Before.
Whether or not you know it, you've heard J.S. Bach's "Little" G Minor Fugue, BWV 578. Originally an organ work, this fugue has been arranged for any number of combinations of instruments and in musical idioms ranging far, far afield from classical. Speaking of which, here's Jacques Loussier's jazz version of Bach's "little" G Minor Fugue: http://www.youtube.com/watch?v=7jLqDvE1Vmw