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=USUAN1100652

MacLeod's description:

Genre: Soundtrack
Length: 0:54
Instruments: Piano, Harp, Bass

Simple melody. Something feels amiss here, but in a sort of pleasing way
ISRC: US-UAN-11-00652
Dark, Eerie, Somber 2009