I tend to work with drum beats and specific rhythms. Rhythm is really important in certain aspects of my practice. Drum beats that sound like horse hooves, for example. And nature is great for sounds while you work.
But I'll admit, when I'm doing Berserking or similar work- I do tend to listen to stuff like Korn, Tool, Puscifer, Rob Zombie. But that's just because it sets the "mood" for that specific work.