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Music radio is a radio format in which music is the main broadcast content. After television replaced old time radio's dramatic content, music formats became dominant in many countries. Radio drama and comedy continue, often on public radio.
Music drives radio technology, including wide-band FM, modern digital radio systems such as Digital Radio Mondiale, and even the rise of internet radio and music streaming services (such as Pandora and Spotify).
When radio was the main form of entertainment, regular programming, mostly stories and variety shows, was the norm. If there was music, it was normally a live concert or part of a variety show. Backstage sound engineers who jockeyed discs (records) from one turntable to another to keep up with the live programming were often called disc jockeys.
With the mass production and popularity of records in the mid 1940s, as well as the birth of TV, it was discovered that a show was needed to simply play records and hire a disc jockey to host the program. One of the first disc jockeys (later called DJs) was Dick Clark. Others followed suit and today music radio is the most numerous format.