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Would you consider these groups "Heavy Metal"?
On occasion, I've seen some here comment that groups like "AC DC" are not "heavy metal". I'd be curious to hear people's opinions.
For reference, AllMusic.com, which I consider to be a definitive source for rock bios, album reviews, etc. puts all 4 in the heavy metal genre. https://www.allmusic.com/style/heavy-metal-ma0000002721