Reginald Fessenden performed ground-breaking experiments with voice and music by 1906. Charles "Doc" Herrold of San Jose, California, sent out broadcasts as early as April 1909 from his Herrold School electronics institute in downtown San Jose, using the identification San Jose Calling, and then a variety of different call signs as the Department of Commerce began to regulate radio. He was on the air daily for nearly a decade when World War II interrupted operations.
A 1948 Production - Behind Your Radio Dial (1947) NBC News on the History of Radio. My employer for nearly a decade
https://www.youtube.com/watch?v=_zcklDrTW4A
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