Full-service radio

Conservatism in the United States is a political and social philosophy based on a belief in limited government, individualism, traditionalism, republicanism, and limited federal governmental power in relation to U.S. states. Conservative and Christian media organizations, along with American conservative figures, are influential, and American conservatism is one of the majority political ideologies within the Republican Party.

Conservative talk radio is a talk radio format in the United States and other countries devoted to expressing conservative viewpoints of issues, as opposed to progressive talk radio. The definition of conservative talk is generally broad enough that libertarian talk show hosts are also included in the definition. The format has become the dominant form of talk radio in the United States since the 1987 abolition of the fairness doctrine.

Middle of the road is a commercial radio format and popular music genre. Music associated with this term is strongly melodic and uses techniques of vocal harmony and light orchestral arrangements. The format was eventually rebranded as soft adult contemporary.

Adult contemporary music (AC) is a form of radio-played popular music, ranging from 1960s vocal and 1970s soft rock music to predominantly ballad-heavy music of the present day, with varying degrees of easy listening, pop, soul, R&B, quiet storm and rock influence. Adult contemporary is generally a continuation of the easy listening and soft rock style that became popular in the 1960s and 1970s with some adjustments that reflect the evolution of pop/rock music.

Country is a music genre originating in the Southern and Southwestern United States. First produced in the 1920s, country primarily focuses on working class Americans and blue-collar American life.

Classic hits is a radio format which generally includes songs from the top 40 music charts from the late 1960s to the early 2000s, with music from the 1980s serving as the core of the format. Music that was popularized by MTV in the early 1980s and the nostalgia behind it is a major driver to the format. It is considered the successor to the oldies format, a collection of top 40 songs from the late 1950s through the late 1970s that was once extremely popular in the United States and Canada. The term is sometimes incorrectly used as a synonym for the adult hits format, which uses a slightly newer music library stretching from all decades to the present with a major focus on 1990s and 2000s pop, rock and alternative songs. In addition, adult hits stations tend to have larger playlists, playing a given song only a few times per week, compared to the tighter libraries on classic hits stations. For example, KRTH, a classic hits station in Los Angeles, and KLUV, a classic hits station in Dallas, both play power songs up to 30 times a week or more, which is another differentiator compared to other formats that share songs with classic hits libraries.

The key demographic or target demographic is a term in commercial broadcasting that refers to the most desirable demographic group to a given advertiser. Key demographics vary by outlet, time of day, and programming type, but they are generally composed of individuals who are younger and more affluent than the general public: "Young adult viewers have been TV's target demographic for decades, because they're thought to have less brand loyalty and more disposable income." In the case of television, most key demographic groups consist of adults who are somewhere in age between 18 and 54. For example, the key demographic for reality television is women with disposable income aged 18 to 34 whereas for the WB Television Network it was "eighteen- to thirty-four-year-old viewers." Television programming is tailored to members of its key demographics: "Despite the increase in time-shifting to watch recorded television and shows on the Internet, the use of television as an advertising vehicle is still determined by demographic characteristics or who is watching at what time." The subset of ratings that only includes the key demographic of 18- to 49-year-olds is often referred to as the "key demo". Certain radio formats and television outlets may target persons 35 to 64, who generally have more disposable income than millennials, in part due to the late 2000s recession, which impeded career opportunities for younger generations.

There are two types of radio network currently in use around the world: the one-to-many broadcast network commonly used for public information and mass-media entertainment, and the two-way radio type used more commonly for public safety and public services such as police, fire, taxicabs, and delivery services. Cell phones are able to send and receive simultaneously by using two different frequencies at the same time. Many of the same components and much of the same basic technology applies to all three.

Contemporary hit radio is a radio format that is common in many countries that focuses on playing current and recurrent popular music as determined by the Top 40 music charts. There are several subcategories, dominantly focusing on rock, pop, or urban music. Used alone, CHR most often refers to the CHR-pop format. The term contemporary hit radio was coined in the early 1980s by Radio & Records magazine to designate Top 40 stations which continued to play hits from all musical genres as pop music splintered into Adult contemporary, Urban contemporary, Contemporary Christian and other formats.

Oldies is a term for musical genres such as pop music, rock and roll, doo-wop, surf music from the second half of the 20th century, specifically from around the mid-1950s to the 1980s, as well as for a radio format playing this music.

Classic hits is a radio format which generally includes songs from the top 40 music charts from the late 1960s to the early 2000s, with music from the 1980s serving as the core of the format. Music that was popularized by MTV in the early 1980s and the nostalgia behind it is a major driver to the format. It is considered the successor to the oldies format, a collection of top 40 songs from the late 1950s through the late 1970s that was once extremely popular in the United States and Canada. The term is sometimes incorrectly used as a synonym for the adult hits format, which uses a slightly newer music library stretching from all decades to the present with a major focus on 1990s and 2000s pop, rock and alternative songs. In addition, adult hits stations tend to have larger playlists, playing a given song only a few times per week, compared to the tighter libraries on classic hits stations. For example, KRTH, a classic hits station in Los Angeles, and KLUV, a classic hits station in Dallas, both play power songs up to 30 times a week or more, which is another differentiator compared to other formats that share songs with classic hits libraries.

Adult standards is a North American radio format heard primarily on AM or class A FM stations.

Classic country is a music radio format that specializes in playing mainstream country and western music hits from past decades.

Nielsen Audio is a consumer research company in the United States that collects listener data on radio broadcasting audiences. It was founded as the American Research Bureau by Jim Seiler in 1949 and became national by merging with Los Angeles-based Coffin, Cooper, and Clay in the early 1950s. The company's initial business was the collection of broadcast television ratings.

Pop music is a genre of popular music that originated in its modern form during the mid-1950s in the United States and the United Kingdom. The terms popular music and pop music are often used interchangeably, although the former describes all music that is popular and includes many disparate styles. During the 1950s and 1960s, pop music encompassed rock and roll and the youth-oriented styles it influenced. Rock and pop music remained roughly synonymous until the late 1960s, after which pop became associated with music that was more commercial, ephemeral, and accessible.

The Community Radio Network (CRN) was a network of radio stations based in provincial centres across New Zealand. The network was operated by The Radio Network (TRN).