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=USUAN1100464

MacLeod's description:

Genre: Horror
Length: 2:38
Instruments: Piano, Synths

Piano with a tape delay and lots of dark colour in the background. 038
ISRC: US-UAN-11-00464
Dark, Eerie, Mysterious, Unnerving 2008