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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early fuzz pedals like the fuzz face and tone bender were a huge game changer for guitarists in the mid-60s 

before that there was no way to make that sound except plugging directly into a console and turning the gain all the way up, e.g. helter skelter

perhaps blues, bebop and rockabilly?

i'm more looking for the most cringe version of a genre that a certain type of guy would gravitate to. so, is there a 1950s version of rockabilly that's like 'mall rockabilly?'

different dynamic. elvis in the 90s woulda been Eminem. looking for the most cringe sub genre type of guy.

as much as i love him, the truth is probably elvis. he was essentially larping as chuck berry

hilarious 

psychobilly?

but that's kind of good too lol