The Federal Communications Commission (FCC) has recently approved a transition to digital radio technology which allows both FM and AM stations to "piggyback" digital data on top of their existing analog broadcasts. When the transition is complete at some point in the far future, the analog broadcasts will be replaced with true high-quality digital broadcasts. See IBOC and HD Radio.
A new form of radio that is gaining popularity is satellite radio. The two biggest subscriptions based radio services are Sirius Satellite Radio and XM Satellite Radio, which have recently both merged together to form Sirius XM Radio. Unlike terrestrial radio music channels are commercial free and other channels feature very minimal commercials. Satellite radio also is not regulated by the FCC.
Arbitron, a consumer research company, provides ratings (similar to the Nielsen ratings) for national and local radio stations in the United States.
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