Credits:

Di Rodrigues
--- title.ogg (CC-BY-SA 3.0)
--- options.ogg (CC-BY-SA 3.0)
--- speed.ogg (CC-BY-SA 3.0)
--- invincible.ogg (CC-BY-SA 3.0)

SilverstepP and Joepotato28
--- boss.ogg (CC-BY-SA 3.0)

coda ( http://coda.s3m.us/ )
--- crusader.ogg
--- luminous_vein.ogg
