"American Idol" has had a huge impact on radio airplay, according to Mediabase, which monitors more than 1,800 radio stations 24/7 in more than 180 U.S. and Canadian markets. The hit TV show
generates more than 6 million radio spins. This week alone, 12 former "American Idol" contestants are on the charts or close to making it on. "Idol" alumni who have dominated the radio charts: Kelly
Clarkson and Carrie Underwood.
