Limited picture disc vinyl LP pressing. Mastodon has taken hold of the leadership of the new wave of progressive heavy metal. The band's 2006 major-label debut Blood Mountain spun off a Grammy nomination and earned Top 5 Best Album Of The Year nods from Kerrang!, Revolver and Metal Hammer, and a Top 10 Rolling Stone. Now Crack The Skye, it's fourth original studio album, mines subject matter from czarist Russia and astral travel to out-of-body experiences and Stephen Hawking's theories on wormholes for an unrepentantly heavy aural assault that will shake the heavens. Mastodon has taken hold of the leadership of the new wave of progressive heavy metal.