New York Herald, March 7, 1907, page 8:
WIRELESS 'PHONE TRANSMITS MUSIC
Conversation, Operatic Selections and Messages from Vessel are Distinctly Heard.
WAKES UP NAVY
Experiments of Telharmonic Management on Dr. Deforest Bring Amazed Brooklyn Operator to New York.
Music, conversation and telegraphic signals from a steamship in the bay were transmitted by wireless and heard through an ordinary telephone receiver in a room in the top floor of the Normandie Hotel, Thirty-eighth street and Broadway yesterday afternoon.
Dr. Lee Deforest, inventor of a wireless telegraph system, gave a public demonstration of apparatus for the adaption of the wireless method to the telephone. Music was transmitted by wireless from Telharmonic Hall, Thirty-ninth street and Broadway, by the New York Electric Music Company, and was plainly heard through a telephone and wireless receiver installed in the hotel, a block away.
Through the same telephone the operator manipulating the teleharmonic apparatus in Thirty-ninth street, announced what selections would be played, asked when the music should be started and stopped and was distinctly heard in Thirty-eighth street by the several persons gathered to witness the test.
That the steamship's wireless should have cut in was an accident. Its apparatus happened to be attuned in accord with that in the Normandie, and the hisses of the wireless apparatus miles at sea shot among the melodies of Mendelasohn's "Spring Song" and other airs.
Keeping their purpose a secret at first, the Telharmonic Hall management and Dr. De Forest erected the wireless pole on top of the Schubert Building in Thirty-ninth street and fitted up the receiving station in the Normandie. This was a week ago, and experiments were made with which it was supposed no one would become acquainted. This illusion was summarily dispelled last Tuesday evening when a man dashed into Telharmonic Hall.
"How are you putting this music on the wireless?" the visitor asked. A diplomatic general denial was forthcoming.
"That won't do," was his reply. "You can't fool me. I'm G. S. MacDonald, chief electrician in charge of the wireless station in the Brooklyn Navy Yard, and I know I heard 'Wilhelm Tell' and 'Ave Maria' over my wireless, and it could not come from anywhere except here."
Dr. Deforest explained yesterday that new apparatus was necessary for the transmission of the voice and music over the wireless by telephone. He is using an oscillator of enormously high frequency of oscillation, and the voice or music is made to increase or decrease the intensity of the electric voltage affecting this oscillator.