It's basically just form of rock that branched out and became it's own separate genre. Kind of like how rock branched out from country, blues, and jazz in the 1950s. Even going back to the roots of rock (and metal) in the early 20th century through the foundation of rock, popular music was constantly becoming louder, faster, and more abrasive. That's how I'd describe heavy metal in comparison to rock 'n' roll.
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