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coffeesp00ns · 3655 days ago · link · · parent · post: What is the most important innovation in the history of rock 'n' roll?
I think, in the context of the article, it's less of an "innovation", and more of a "What made rock and roll an important force in the 20th century?" I think they just chose a bad descriptor. if you take that context, too, then the answer "the radio" makes more sense, i think.