what kind of music were guys who were making nü metal in the late 90s making in the 50s. or did this kind of guy simply not exist yet.

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Insert whatever word works for “different” or outside the expected. Also inauthentically appropriating something for mass appeal. Not literally “dangerous” just aiming for radically outside the norm for a moment.

nah but nu metal was never dangerous. it was always mall rock.

In a way, Buddy Holly and Elvis were those guys. “Dangerous” at the time, they’d keep their fan bases but become corny compared to when The Beatles came onto the scene and the 60’s started to swing.

You’re looking for Dick Dale

https://m.youtube.com/watch?v=mKpsuGMeqHI&pp=ygUJRGljayBkYWxl

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I can also tell you what this type of guy sounded like in 1972. You need to find a bad version of Bo Diddley for the 50s

https://m.youtube.com/watch?v=Pb605jAQUlk

yeah that might be the closest so far although technically that was the 60s

Whatever Biff from Back to the Future liked to listen to

I’m guessing they were forming barbershop quartets