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=USUAN1100351

MacLeod's description:

Genre: Unclassifiable
Length: 2:54
Instruments: Synths
Tempo: 120

100% electronic creepiness. Change from round and bleeping to harsh bleeping about 2 minutes in. 021
ISRC: US-UAN-11-00351
Dark, Eerie, Unnerving 2007