This industry comprises establishments primarily engaged in broadcasting audio signals. These establishments operate radio broadcasting studios and facilities for the transmission of aural programming to the public, to affiliates, or to subscribers. The radio programs may include entertainment, news, talk shows, business data, or religious services. Cross-References. Establishments primarily engaged in-- ? Broadcasting exclusively on the Internet--are classified in Industry 51913, Internet Publishing and Broadcasting and Web Search Portals; and ? Producing taped radio programming--are classified in Industry 51229, Other Sound Recording Industries.