Music by Kevin MacLeod (original composer: J. S. Bach). Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100294

MacLeod's description:

Genre: Classical
Length: 5:53
Instruments: Organ

Bach. Among the most complex fugues ever written. 008
ISRC: US-UAN-11-00294
Intense, Dark, 2004