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Old-Time Radio (OTR) and the Golden Age of Radio refer to a period of radio programming lasting from the proliferation of radio broadcasting in the early 1920s until television’s replacement of radio as the dominant home entertainment medium in the late 1950s and early 1960s.
The end of this period coincided with music radio becoming the dominant radio form and is often marked in the United States by the final CBS broadcasts of Suspense and Yours Truly, Johnny Dollar on September 30, 1962.
Source: Wikipedia

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