Enter Sandman by BruceM

Question 7

What three-word phrase fills in the blanks of this Lars Ulrich quote, a reaction to learning that U.S. interrogators in Iraq used "Enter Sandman" to break uncooperative prisoners?

"If there are people that are dumb enough to use Metallica to interrogate prisoners, you're forgetting about all the music that's to the left of us. I can name, you know, 30 [BLANK] [BLANK] [BLANK] bands that would make Metallica sound like Simon & Garfunkel"

This is a musical genre (referring to a specific nation), exemplified by bands like Bloodthorn and Zyklon.

Norwegian death metal