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What about Black Sabbath:
classic metal
Iron Maiden:
classic metal
Megadeth:
classic metal
Mudvayne
altenative/
hevy/
nu/
progressive metal
Avenge Sevenfold:
metalcore
Lamb of God:
hevy metal
They're so many more metal bands your leaving out... and why are you leaving out the old school metal such as AC/DC, Black Sabbath, Led Zepplin, Metalica, Iron Maiden, Megadeth, Korn...?
I understand classifying certain metal as "Classic" for being in the 60's-90's, but there is no genre called Classic Metal.
Mudvayne, A7X and Korn are not metal. GG.