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=USUAN1100215

MacLeod's description:

Genre: Soundtrack
Length: 1:34
Instruments: Strings

Methodical and depressing short piece. Written as a quick composition study with only strings. 036
ISRC: US-UAN-11-00215
Dark, Somber 2007