Noun describing a mindset among certain heavy metal fans who are preoccupied with distinguishing between "true metal" and "false metal". Typically, heavy metal purists dislike false metal, which often is taken to include glam metal, nu metal, alternative metal and metalcore.

Heavy metal purism tends to be more prevalent among younger metalheads, especially black metal fans. Practitioners of heavy metal purism are sometimes referred to as heavy metal purists.

Also often referred to as "metal purism" or "metal-purism"
“I thought it was really cool,” says Henke remembering when Bring Me The Horizon talked wanting these futuristic sounds. “They’re so creative and had so many ideas about what they wanted.
“Sometimes we didn’t know quite what they had in mind,” adds Fredrik. “But in the end it all made sense.
Did it go against any ‘heavy metal purism’ you might have had?
“Haha, no,” he laughs. “Good stuff is good stuff, and bad stuff is bad stuff. They do it right. I think many bands will follow them.”
by Master of Evöl March 5, 2011
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