Music by Kevin MacLeod. Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100869

MacLeod's description:

Genre: Contemporary
Length: 4:13
Instruments: Bass
Tempo: 41

Solo bass with a looping pedal. Very very slow. Super nice. Starts with the highs, and builds interest in the bass.
ISRC: US-UAN-11-00869
Calming, Relaxed 2011