Hatebreeder
Pizzicato Heartstrings
eh, I don't know about that, you have pure power metal, speed/power, classical/power, thrashy power metal, prog/power. I would say it has much more variety than black metal
But that's still all within the bounds of guitar-driven hard rock/metal, so you haven't really disproved me. I was referring more to pre-rock/metal musical breakthroughs like blues, jazz, etc.