A Mastodon tour is cool enough on its own. The thunderous riffs and progged-out guitars of the Atlanta-based quartet should satisfy the appetite of the most insatiable long-tressed, spike-belt-wearing, potentially-wizard-beard-possessing metalhead. But the key with metal is that old saw "too much is never enough." Good thing the architects of Mastodon's upcoming tour understand that wisdom, because they've gilded the proverbial lily, painted it black, and set it on fire with pentatonic chords screaming in the background. Yes, that's right: Brendon Small and company will don the mantles of Metalocalypse's semi-fictional Dethklok to co-headline Mastodon's tour.