It's often tempting to bundle decades of human civilization into neat little packages with definable borders for cultural phenomena, but in reality, trends, fads, and movements swell and recede across time in a far blurrier and indistinct manner. Were the '80s all hair metal, for instance? Were the '90s all grunge ? Were the '00s all ... OK, we don't know what the '00s were supposed to be except full of sticky-looking lip gloss and oversaturated colors in music videos. And the '70s? It wasn't all disco. In fact, it was very much all about rock.

The fact that the '70s rocked will come as no surprise to folks who were alive then. In popular, highly reduced conception, the black-and-white '50s were maybe Elvis and Frank Sinatra, the '60s were the Beatles and a shaggy-haired summer of love,

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