A radio program (radio programme in the United Kingdom) or radio show is a segment of content intended for broadcast on radio. It may be a one-time production or part of a periodically recurring series. A single program in a series is called an episode.
In Britain, radio broadcasting was dominated entirely by the BBC, which since the early 1920s had been developing a broad spectrum of programming including different genres of music and speech, including documentaries, drama, comedy, news, religious broadcasts, children's programmes, schools broadcasts and sports coverage). BBC output was a unifying force within British culture, and has been written about extensively elsewhere.
In the 1950s, a small but growing cohort of Rock and pop music fans, dissatisfied with the BBC's output, might listen to Radio Luxembourg, but to too small an extent to have any impact on the BBC's monopoly and invariably only at night, when the signal from Luxembourg was stronger. During the post-1964 period, western Europe offshore radio (such as Radio Caroline broadcasting from ships at anchor or abandoned forts) helped to supply the demand for the pop and rock music. The BBC launched its own pop music station, BBC Radio 1, in 1967.
Interest in old-time radio (OTR) has increased in recent years with programs traded and collected on reel-to-reel tapes, cassettes and CDs and Internet downloads, as well as the popularity of podcasts.