Hmm.. Couldn't you say that for most genres? I mean, what's the difference between jazz, blues, rock, funk, soul, and the train goes on? Metal is a sub-genre of rock. Metal closely resembles Hard Rock. Punk has roots in metal. Blues has roots in metal. Punk has similarly fast riffs as metal. Alternative rock can have harsh distorted guitars like metal. There must be a commonplace separating them? And I'm guessing they do it with the most common attributes.
The question is too general I suppose.
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