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=USUAN1100481

MacLeod's description:

Genre: Soundtrack
Length: 1:58
Instruments: Bass Clarinet, Basses, Cellos

Very slow piece featuring bass clarinet with a couple of backing double basses. 036
ISRC: US-UAN-11-00481
Somber 2008