IronWolf
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I'd say the Shaman is just looking at the pop-metal bands like A7X, which while "rebellious-y", are so mainly in terms of form and not message.
There are still metal bands out there that espouse anti-Christian, anti-conformist, anarchic, violent or pro-drug etc. messages- and some that even live their music- that I still have to point at metal as one of the truly rebellious musical genres out there.
That was my thought as well. While I have not kept up with the heavy metal scene for many years, I know when I was that what the mainstream were listening to and calling heavy metal was *not* the heavy metal that I was listening too.