Accommodated as we are to mass media, we must work to imagine the impact of commercial radio broadcasting in its early years. From the late 1800s, new electronic devices had been expanding the realm of shared human experience — people conversed on telephones, sent news through telegrams, played records on phonographs, and enjoyed films in local theaters. But until the radio, nothing offered such widely shared simultaneous mass experience. By turning on your radio set, you could listen to a jazz band, baseball game, religious service, even a president’s speech, live, along with millions of fellow listeners.