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=USUAN1100513

MacLeod's description:

Genre: Unclassifiable
Length: 1:58
Instruments: Synths
Tempo: 130

An eerie piece featuring synths. Great for ambiance. Starts light, gets progressively eerier and more mysterious. Climaxes at the end, finishes with a single beat. 029
ISRC: US-UAN-11-00513
Eerie, Mysterious 2008