Music by Kevin MacLeod (based on Chopin), Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100576

MacLeod's description:

Genre: Horror
Length: 0:46
Instruments: Piano, Strings
Tempo: 56

This piece takes its main theme from Chopin, completely reharmonizes it, and gives it a different setting. One of three pieces with this theme. 035
ISRC: US-UAN-11-00576
Dark, Mysterious, Somber 2009