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=USUAN1100455

MacLeod's description:

Genre: Contemporary
Length: 2:33
Instruments: Piano

Impromptu performed on a Steinway Model D tuned to Quarter Comma Meantone. This gives a very rich feel to the base chords, but leaves a couple of "wolf notes" in the gaps (most notably in the Ab). 2 minutes in, it lingers on the most out-of tune part of the scales.
ISRC: US-UAN-11-00455
Calming, Eerie, Somber 2008