RADIO

Radio was the first medium for broadcast journalism. Many of the first radio stations were co-operative community ventures not making a profit. Later, advertising to pay for programs was pioneered in radio. Later, television displaced radio and newspapers as the main news sources for most of the public in industrialized countries.
Some of the programming on radio is locally produced; some is broadcast by a network, by syndication, etc. The "talent" (professional voices) talk to the audience, including reading the news. People tune in to hear engaging personalities, music, and information that they want. In radio news, stories include speech "sound bites", the recorded sounds of events themselves, and the anchor or host.
The radio industry has undergone a radical consolidation of ownership, with fewer companies owning the thousands of stations. Large media conglomerates such as Clear Channel Communications own most of the stations in the United States. That has resulted in more "niche" formats and the sharing of resources within clusters of stations, de-emphasizing local news and information. There has been concern over whether that concentration of power serves the public. The opposition says that the range of political views expressed and supported is greatly narrowed and that local concerns are neglected, including local emergencies, for which communication is critical. Automation has resulted in many stations broadcasting for many hours a day with no one on the station premises.