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=USUAN1100471

MacLeod's description:

Genre: Horror
Length: 1:31
Instruments: Piano

Solo piano, which is not in tune (traditionally speaking). 4/4 time with some asymmetries. 006
ISRC: US-UAN-11-00471
Dark, Mysterious, Mystical, Unnerving 2008