The introduction of disc jockeys was another major boost in the survival of radio after television. Broadcasters paid DJs to spin records rather than paying for unionized musicians, actors, and large studios. DJs also were hired to promote their records, in hopes of boosting their sales.
The invention of FM radio in 1941 was another major step forward for radio. Previously, the broadcasts had been taking place on AM band which contained irritating static and unclear sound. FM had a shorter range than AM but it was virtually static free. FM had a number of setbacks including rejection from the public but eventually FM's popularity spread nationally beginning with the changes in tone and dynamics compared to AM radio.
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