King Sombra sings Crystal Skull by Mastodon! All of my yes!!! xD Haha yes this song is pitched so it made it sound like it was sung by the crystal king himself. Also, Big Jim Miller, King Sombra's voice actor, drew inspiration from the vocals of the Mastodon song "Crystal Skull" for his performance as King Sombra. So yes... xDD His voice was inspired by this song!! Hope you guys like. 

(c) Fan art by atryl- http://anycarrp-sombra.deviantart.com/art/30min-Challenge-King-Sombra-337312445 Song by Mastodon.