"Like their metal peers, Mastodon sport some mathematics. But where Meshuggah get deep into calculus and Dillinger Escape Plan prefer trigonometry, these guys enjoy the more accessible stuff-- we're talking pre-algebra here. They drop in just enough to keep the arrangements flavorful, but not so much as to overload the vintage guitar riffs with Dream Theater-like complexity. And then they counterbalance it with some nice, old-fashioned, Sabbath-style metal attitude: guitars crunch, wail, and burn. The complete package sounds timeless, but in that unbelievable way that you've never heard before".