Old-Time Radio (OTR) and the Golden Age of Radio refer to a period of radio programming lasting from commercial radio's introduction in the early 1920s to its replacement in the late 1950s and early 1960s by television as the dominant home entertainment medium. During this period, when radio was dominant and the airwaves were filled with a variety of radio formats and genres, people regularly tuned in to their favorite radio programs. In fact, according to a 1947 C. E. Hooper survey, 82 out of 100 Americans were found to be radio listeners. The end of this period coincided with music radio becoming the dominant radio form and is often marked by the final CBS broadcasts of Suspense and Yours Truly, Johnny Dollar on September 30, 1962.
Radio content in the Golden Age of Radio had its origins in audio theatre. Audio theatre began in the 1880s and 1890s with audio recordings of musical acts and other vaudeville. These were sent to people by means of telephone and, later, through phonograph cylinders and discs. Visual elements, such as effects and sight gags, were adapted to have sound equivalents. In additions, visual objects and scenery were converted to have audio descriptions.