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[DeathDude]

That's a first I've heard of Sunn 0)) not being called a metal band, many of the boards I have frequent say they are a metal band moreso than other bands.

Ateryu may be part of the metalcore genre but that's not part of the metal genre at all it's been practically accepted by most people on metal boards if ya look around, just like nu-metal isn't either, really annoys me when I see their albums in the metal section cause they don't belong there.

Metal does indeed owe some of it's influences from rock, but yeah they both have there crossovers with instrumentation and the such. Some aspects like dual melodies originated from metal though, that you can owe to Judas Priest, it was Iron Maiden who took it further with their albums of having a dual guitar sound, and they were one of the first well known bands to integrate 3 rhythum tracks together. But they have there similarities that's for sure, look at progressive rock and progressive metal, essentially very similar with many bands owing some of their influences to progressive rock acts like Pink Floyd, Deep Purple, Yes, and so on.