Dave Grohl actually does shred his voice. I remember a Fresh Air interview where Terry Gross asked him about that, then mentioned that she had interviewed Melissa Cross (the vocal coach who released The Zen of Screaming.)
Dave said something along the lines of he thinks his mom bought him that video, and he should probably sit down and watch it because he does horrible things to his voice.
That interview was a while ago, so maybe he has gotten around to improving his vocal technique.
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