I don't even really know what makes music "extreme". And looking back at my post, the Necrophagist and Cryptopsy and stuff... I mean, yeah, it's called "extreme" because of how fast and technical it is, but really, isn't a band as talented as that really just a bunch of dorks? And dorks ain't extreme!
So, I'd like to change my answer... Lustmord - Heresy. That's probably considered extreme.
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