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=USUAN1100655

MacLeod's description:

Genre: Electronica
Length: 6:20
Instruments: Synths, Percussion, Strings, Bells
Tempo: 90

Add a dark intensity to any scene... Is there building action? Is there a clue? Is there a need for ambiguity?
ISRC: US-UAN-11-00655
Dark, Eerie, Mysterious, Mystical, Somber, Unnerving 2009