Radio Amateur News, May, 1920, page 646:
WASHINGTON RADIO AMATEURS HEAR RADIO CONCERT.
Recent development of radio telephony at a Washington, D. C., experiment station here has reached the stage where thirty amateurs on the receiving ends of wireless apparatus throughout the city reported that they hear musical records being played at the Bureau of Standards Radio Research Laboratory. F. W. Fennimore of the Bureau of Standards has been aiding in the development of the radio telephone for several weeks, but experiments did not reach the stage of perfection which allowed a general reception of a musical program until several nights ago. Mr. Fennimore called up his wife by radiophone at about 9 p. m. She replied that she was entertaining company, and requested that a musical number be put on by radio. According to reports the music was heard well enough to dance with at the Fennimore home. Shortly after the record was sent out, thirty calls from amateurs throughout the city announced that they were listening in and "getting it."