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=USUAN1100419

MacLeod's description:

Genre: Soundtrack
Length: 2:03
Instruments: Clarinets, Bass Clarinet, Xylophone, Strings, Piano

Starts at a fast pace, and slows. 035
ISRC: US-UAN-11-00419
Action, Dark, Intense, Unnerving 2008