Even if they were you still wouldn't hyphenate there.

So - all the power and black metal bands in europe?

Like the Tin Man in The Wizard of Oz.

Honestly I considered this interpretation for far too long - "extremely-metal" but poor. Now what that means I don't know, but I thought it might have related to something an astronomer could tell me

I was waiting for this interpretation. Alas, fixed now.