Kevin MacLeod ~ Well-tempered Raver [original composer: J. S. Bach]
Description YT
Music by Kevin MacLeod (original composer: J. S. Bach). Released into the public domain (CC Zero). Download link: http://freepd.com/Electronic/Well-tempered%20Raver
MacLeod's description:
Yeah, it is what you think it is... Book 1. Number 1. Doesn't get to the end, though.