50's / Elvis, Chuck Berry and Rock & Roll
60's / The Beatles and The British Invasion, Psychedelia and the beginnings of Heavy Metal
70's / Arena Rock, FM Radio, Drugs and Rock & Roll. And disco.
80's / New Wave, Hair Metal and MTV
90's / Grunge, Alternative, RockCountryPop blurring and Boy Groups
00's / Every possible Genre and SubGenre and SubSubGenre imaginable
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