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=USUAN1100663

MacLeod's description:

Genre: Soundtrack
Length: 1:48
Instruments: Piano, Bass, Glock

6 of 8. Waltz-like theme.
ISRC: US-UAN-11-00663
Eerie, Mystical, Somber 2010