Mastodon have a new e-card featuring live footage from their recent appearance on the Slayer-led Unholy Alliance tour. You can check out live performances of "Crystal Skull," "Capillarian Crest" and "Blood and Thunder" right here. The band is gearing up for the release of their major label debut Blood Mountain on September 12th. The album follows their 2004 album, the Moby Dick-inspired Leviathan.

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