I can't really put a specific label on this band... sure, they're rock, maybe some traces of Metal, but they don't really fit any one specific genre. I'm not saying they sound like Clutch, but I put them in a similar category, they're pretty strait up groove oriented rock with amazing musicianship. The were produced by David Prater, who also worked with Dream Theater, and ironically, they have a similar vibe at times as DT at times. "Bleechin' Bones" almost sounds like some of of DT's later material.

Even though Lethargy has some heavy licks, it almost has a calming effect at time, it's produced so well and the songs are kept at an even pace. Another band I compare them to a bit is CKY, who also manage to fit under several categories. Having said all this and made all these comparisons, I could also envision the band on mainstream radio! I think maybe the production and tones lend itself towards a more modern sound. Normally I would say getting onto mainstream radio is a bad thing, but these guys are very very talented with some good ideas. I think they're only going to get better considering they're all in their teens and early 20's.