While stereotyped as rural music, the Country music format is common and popular throughout the United States and in some other countries (particularly Canada and Australia, both of which share much of the same Anglo-Saxon and Celtic roots as the United States). Country has been a popular radio format since the early days of music radio, dating back to the early days of radio itself when barn dance radio programs were widely popular; however, the format was indeed originally a predominantly rural phenomenon, especially on AM radio. Decades worth of efforts at mainstreaming the format eventually paid off when country radio became widely popular among a large number of FM radio stations that signed on in the suburban United States in the 1980s and early 1990s.