Concept
A radio format or programming format (not to be confused with broadcast programming) describes the overall content broadcast on a radio station. The radio format emerged mainly in the United States in the 1950s, at a time when radio was compelled to develop new and exclusive ways to programming by competition with television. The formula has since spread as a reference for commercial radio programming worldwide. A radio format aims to reach a more or less specific audience according to a certain type of programming, which can be thematic or general, more informative or more musical, among other possibilities. Radio formats are often used as a marketing tool and are subject to frequent changes. Except for talk radio or sports radio formats, most programming formats are based on commercial music. However the term also includes the news, bulletins, DJ talk, jingles, commercials, competitions, traffic news, sports, weather and community announcements between the tracks. Even before World War II, radio stations in North America and Europe almost always adopted a generalist radio format. However, the United States witnessed the growing strengthening of television over the radio as the major mass media in the country by the late 1940s. American television had more financial resources to produce generalist programs that provoked the migration of countless talents from radio networks to the new medium. Under this context, the radio was pressured to seek alternatives to maintain its audience and cultural relevance. As a consequence, AM radios stations began to emerge in the United States and Canada – many of which "independents", that is not affiliated with the network – developed a format which targeted audiences with programming consisted of music, news, charismatic disc jockeys to directly attract a certain audience.