Music by Kevin MacLeod (original composer: Camille Saint-Saëns). Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100546

MacLeod's description:

Genre: Classical
Length: 6:46
Instruments: Full orchestra

Written by Saint Saens in 1874. This is a quite well known and epic piece of music. 005 See the wikipedia article [http://en.wikipedia.org/wiki/Danse_Macabre_(Saint-Sa%C3%ABns%29] on the piece for more information.
ISRC: US-UAN-11-00546
Epic, Intense, Mysterious 2009