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=USUAN1100450

MacLeod's description:

Genre: Soundtrack
Length: 3:04
Instruments: Trombones, Basses, Flutes, Clarinet, Marimba, Percussion, Horn, Violins, Violas
Tempo: 79

Starts without percussion, then adds in a groove later on. 042
ISRC: US-UAN-11-00450
Dark, Epic, Intense, Somber, Unnerving 2008