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=USUAN1200071

MacLeod's description:

Genre: Jazz
Length: 2:41
Instruments: Bass
Tempo: 112

Just your average work-a-day upright walking bass line. Add reverb to taste. Noir! ISRC: USUAN1200071 Dark, Grooving, Mysterious 2012