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=USUAN1100180

MacLeod's description:

Genre: Horror
Length: 1:59
Instruments: Percussion

More a creepy orchestral percussive soundscape than a piece of music with melody and harmony. That thing you can't identify is a gong being played abnormally. 035
ISRC: US-UAN-11-00180
Unnerving, Eerie, Suspenseful 2006