Power chords, humbucker pickups, screaming tube amps and distortion pedals. It happened around the 9000 BCE mark, with the use of the first copper guitars (hence the name “electric”).
Just kidding in the first and last part. Trial and error with native (naturally occurring) metals, probably, like copper, silver, gold, tin, and meteoric iron.
Metal-working led to another happy accident: glass was probably discovered as an accidental by-product of smelting.
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