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=USUAN1100710

MacLeod's description:

Genre: Horror
Length: 3:26
Instruments: Harp, Violins, Percussion, Synths

A simple harp refrain plays a child's melody, but is torn apart by discordant screeching noises, thumps, growls, and mechanical noises. 037
ISRC: US-UAN-11-00710
Dark, Eerie, Intense, Suspenseful, Unnerving 2010