That was more a refferance to the Kickapoo song in Pick of Destiny (MOvie was decent, though the music from it was awesome. :p), though I do believe Dio is doing a voice in the game. :p
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let's do a quick feature list:
* Storyline penned by the hilarious Tim Schafer
* Voice acting by Jack Black and rock legends Lita Ford, Lemmy, Rob Halford, and Ozzy Osbourne
* 108-song metal soundtrack
* Gameplay-distinct singleplayer and multiplayer packages
* Sacred Beer Tree
need we say more