This writer hits it on the head.
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The bands of the late-70's such as Sex Pistols, The Clash, Black Flag, Dead Kennedys etc..gave a new sound and a new voice of protest stemming from the 1960's counterculture and became the harder edge that woke up the world.
I wish I could say that it still exists today but, the so-called bands who claim to be punk, sing merely about pointless issues of how they thrashed their skateboard or about a girl/boy that broke their heart. (Avril Levigne, Green Day, etc)
These posers are tatted from head to toe sporting Mohawks and claim to be punk? Come on. You're not 'Punk',...You're a corporate puppet and conformist who follows every command (such as fashion) and lives only by the philosophy of 'what sells' to the masses. This is not the ideology that started the revolution.
In Punk there are no rules, no regulations, no politically correct statements - just sheer protest and a voice that has no limits or boundaries. These were the ideals of the pioneers of Punk and maybe there are a few hopefuls that still are out there, not selling out but, ultimately, I'm afraid that the truth remains : Punk is dead. Maybe solely by definition but, its legend still reigns and while others may claim to be it, they haven't got a clue what defined it.
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And punk in the sense of pure-straight-up-punk died before the end of the 70s. Lots of bands in the 80s tried to flog the punk horse, but they invariably sucked.
If you look at the so-called indie nowadays, it's just boring safe hipster music.
Which brings us to the later movement known as pop-punk. In the early 90s, bands such as Green Day, Blink-182 and the Offspring took punk and Nirvana and made it lighter, friendlier, more immature and (arguably) catchier. They started up a new sound, different from punk but it became known as punk anyway, and appealled to a generation of kids...
A style can never die, obviously. It can just be done so much that anyone who tries it is only being derivative of what has come before. But a movement can die.