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=USUAN1100460

MacLeod's description:

Genre: Classical
Length: 1:09
Instruments: Piano, Violin, Viola
Tempo: 104

An unfinished trio in 2 main parts.
ISRC: US-UAN-11-00460
Dark, Relaxed, Somber 2008