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=USUAN1100524

MacLeod's description:

Genre: Classical
Length: 4:38
Instruments: Piano

Somber Solo Piano, with repetitive descending arpeggio motive. Contains uplifting moments, but generally sparse and mysterious.
ISRC: US-UAN-11-00524
Calming, Dark, Eerie, Mysterious, Relaxed, Somber, Unnerving 2008