Pittsburgh is celebrating its 250th anniversary and I saw these items in
the historical timeline.

Oct. 17, 1919: Westinghouse engineer Frank Conrad, an amateur radio
operator, decides to save his voice by placing a microphone in front of
his phonograph and playing some records, thus inadvertently producing
the first musical radio broadcast. His fellow amateur radio operators
urge him to do more, and he begins borrowing records from a nearby music
store in exchange for mentioning their names during the broadcast, thus
inadvertently creating the first radio commercials.

1928 - Having conquered the worlds of radio programming and advertising,
Westinghouse engineer Frank Conrad cooks up a method for transmitting
motion pictures via radio waves. On Aug. 8, in its East Pittsburgh
laboratories, Westinghouse stages a demonstration of the technology,
dubbed "television."

Here is a 13 minute audio clip from NPR concerning  Conrad's experiments
which lead to the establishment of KDKA.

http://www.albany.edu/talkinghistory/radiodiaries/rd-conrads_garage.mp3