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=USUAN1100047

MacLeod's description:

Genre: Soundtrack
Length: 0:57
Instruments: Orchestral - Cello, Horn, English Horn, Clarinet, Contratuba

Starts with cellos, adds horn, clarinet, English horn, contra-tuba - to a final sustained chord. Slow. Thin yet satisfying. 035
ISRC: US-UAN-11-00047
Dark, Somber, Calming 2006