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PUNK ROCK. Late 1970s - current.
Punk is a kind of smirk against all pretentious things. Partly as a reaction to Disco, and Glam Rock (below), punk kicked off on both sides of the atlantic around the same time, though 60s garage bands had already used some of the styles but it just hadn't swept so widely across the media as a "new young rebellion". The same way of singing is still used eg AudioBullys, Slaves.
HARD ROCK for CLASSIC ROCK radioplay. 1970s - 80s.
Hard Rock has a give and take in styles with US Garage, Prog, and Heavy Metal. Classic rock just means a standardized format for radio plays. Commercial bands like AC/DC, Queen and Kiss, gave rise by the 80s to massive concert sets targeting to worldwide tours with a huge, sadium filling sounds.