Music by Kevin MacLeod (original composer: unknown). Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100724

MacLeod's description:

Genre: Horror
Length: 1:09
Instruments: Strings, Percussion, Toy Piano
Tempo: 108

Heavy bass drums and an string bass set the tone for this dark and menacing tone. The familiar refrain then plays, but is made expressive and almost violent as it is played on several string basses and cellos. The pace is rather quick and forceful, and after the quick ending, a jack-in-the-box plays, normally child-like, but made creepy because of the sinister music that came before. 035
ISRC: US-UAN-11-00724
Dark, Eerie, Intense, Unnerving 2010