But by the early 1920s, the broadcast model that would come to dominate the technology had evolved. Professional stations began delivering packaged news and entertainment to consumers who listened on radio receivers in their homes. Almost immediately, something entirely unexpected happened: the existence of a mass medium for sound unleashed a new kind of music on the United States, a music that had until then belonged almost exclusively to New Orleans, to the river towns of the American South, and to African-American neighborhoods in New York and Chicago. Almost overnight, radio made jazz a
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