Lexington (Kentucky) Herald, June 25, 1920, page 4:


Aviators  Dance  to  Notes  of  Long  Distance  Music
(Letter  of  Army  Air  Services.)
    The personnel at the Aviation Repair Depot at Indianapolis were treated to a surprise by the commanding officer at a dance, to which relatives and friends of the soldiers were invited. They were thoroughly enjoying themselves dancing to the music of a modern jazz band, when suddenly the band ceased playing in the middle of a two-step, and in its place music from another jazz band floated through the air from a graphophone. This created somewhat of a sensation and everyone stopped to investigate, but could not find the graphophone anywhere. However, one of the enlisted men found a large Magnavox amplifier concealed in the upper part of the hall. The graphophone was located in a building over 500 yards from the dance hall. A waltz was next played and every note was as distinct as if it had been played in the room where the dance was being held. The expression on the faces of the guests illustrated that they were clearly mystified, but nevertheless thoroughly enjoyed themselves with the wireless music.
    The commanding officer carried this experiment a little further the following day. A Victrola was connected to the wireless telephone and a concert was given for the benefit of amateur and professional radio stations surrounding Indianapolis for a distance of 400 miles. Numerous reports have been received from amateur and also professional stations that music was very distinct. So successful have these experiments been that recruiting parties are being sent out equipped with wireless apparatus, and concerts were given from the main stations and also exhibitions of wireless communication with aeroplanes in the air. The most difficult problem is to convince the average person that aeroplanes in flight can be communicated with from the ground.