I just watched this a couple of days ago. His final thoughts about the future of heavy are easily proven by looking at your own past. I remember when War Pigs

I just watched this a couple of days ago. His final thoughts about the future of heavy are easily proven by looking at your own past. I remember when War Pigs seemed impossibly heavy. But even my own band 30 years ago was far heavier. And there's a lot of music far heavier than that was. I don't think music has gotten heavier since the 90's though. The heaviest stuff I know is, for example Swedish or Finnish heavy metal. Seriously brutal stuff. Even with modern distortion, today's heaviest bands are not heavier than that. But eventually something will come up, and heavy will go up another notch.