Earlier quoted context omitted.
As a black English man who enjoys a bit of rock and metal myself I have wondered this myself. I have some theories, which I fully admit are half baked and quite possibly incorrect. However, I think that a lot of the culture around rock and metal is off-putting to a lot of black people. If you look at something like black metal and it's sub-genres, a lot of the culture and imagery revolves around satanism and European…
There are underground metal scenes in the Muslim world, in spite of disapproval from officialdom that the music is anti-religious. Those in Lebanon and Iran have been well covered, for example. Often its afficionados speak of the supposed universality of metal, and certainly don’t see it as bound to European paganism, so that alone doesn’t seem to explain its failure to connect with those of Afro and Caribbean herita…
These may not be what most people think of when they think of dance, but most people also don't think of growling when they think of singing, and yet growling is a form of singing - and in fact one that is connected to traditional forms of singing like the Kargyraa technique in Tuvan throat singing [1] or the Sufi zikar [2].
And if I had a penny for every time I've been told "that's not music" for any metal band I liked to listen to, I'd be a penny gazzilionaire.
I digress. You also can dance-dance to metal. Why not? It's got rythm to spare. If we don't see anyone dancing-dancing to it it's only because metalheads are ... to be kind, self-conscious.
It's just a matter of what we're used to I think.
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[1] https://en.wikipedia.org/wiki/Tuvan_throat_singing#Kargyraa
That's when they start to growl as they whistle. Mental.
[2] Particularly Kemal Zikar; for example:
https://www.youtube.com/watch?v=8GZnVKcSzMM
https://www.youtube.com/watch?v=NRnjV013f5I
Bonus Sufi zikar mosh pit (with genuine respect):
https://www.youtube.com/watch?v=G5goISKPSH8
And with headbanging: