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=USUAN1100871

MacLeod's description:

Genre: Contemporary
Length: 4:10
Instruments: Bass
Tempo: 118

Solo bass. Non-consistant tempos. No looping, just playing.
ISRC: US-UAN-11-00871
Calming 2011