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A genre used to describe Mastodon's 2004 concept album, Leviathan, which is based on the story of Moby Dick. Frustrated that they were unable to fit the album into existing genres, fans of the band coined the term to point out the inherent humor in dedicating a full-length metal album to the topic of a whale. The album can be most accurately described as a mix of heavy metal, metalcore, and progressive metal.
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