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Heavy Riffs (in no order)

Walk - Pantera
Cowboys From Hell - Pantera
I'm Broken - Pantera
Mouth For War - Pantera
Into The Void - Black Sabbath
Iron Man - Black Sabbath
Crazy Train - Randy Rhoads

But The Heaviest Riff Ever

A New Level - Pantera
\m/ (-_-) \m/
Last edited by DRMguitar at Aug 8, 2013,
Second half of Sabbath, Bloody Sabbath.

Heaviest riff I've ever heard in my life.