James Hetfield's throwing some proper reverence toward Tony Iommi, and honestly, it's hard to argue with the man when he's talking about the architecture of heavy metal itself. Black Sabbath basically invented the riff as we know it, and when the Metallica frontman is nodding to that lineage on his SiriusXM show, it's a nice reminder that even the biggest names in metal are standing on the shoulders of giants. For Cledvibes Radio listeners who love their heavy stuff, this is the kind of mutual respect between generations that keeps rock music honest and grounded.