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=USUAN1100578

MacLeod's description:

Genre: Horror
Length: 1:45
Instruments: Piano, Strings, Choir, Tympani
Tempo: 55

This piece starts with piano, and ends with tymp. It uses a reharmonized theme taken from Chopin. One of 3 pieces with this theme. 038
ISRC: US-UAN-11-00578
Dark, Mysterious, Somber 2009