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=USUAN1100792

MacLeod's description:

Genre: Contemporary
Length: 1:04
Instruments: Bass
Tempo: 56

Intricate finger styling on a bass guitar creates a thematic melody full of solitude that drastically slows to a lethargic ending. This makes for a great transition piece for an outdoors scene or to depict isolation.
ISRC: US-UAN-11-00792
Calming, Relaxed 2011