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=USUAN1100326

MacLeod's description:

Genre: Soundtrack
Length: 1:38
Instruments: Choirs, Flutes, Celesta, Glock
Tempo: 80

Many choirs in a slow-moving ethereal progression. 045
ISRC: US-UAN-11-00326
Eerie, Epic, Mysterious, Mystical, Unnerving, Uplifting 2007