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In page San Jose, California:

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In April 1909, Charles David Herrold, an electronics instructor in San Jose, constructed a radio station to broadcast the human voice. The station, "San Jose Calling" (call letters FN, later FQW), was the world's first radio station with scheduled programming targeted at a general audience.[citation needed] The station became the first to broadcast music in 1910. Herrold's wife Sybil became the first female "disk jockey" in 1912. The station changed hands a number of times before becoming today's KCBS in San Francisco.[2]