Various American Idol alumni had success on various record charts around the world; in the U.S. they had achieved 345 number ones on the Billboard charts in its first ten years. According to Fred Bronson, author of books on the Billboard charts, no other entity has ever created as many hit-making artists and best-selling albums and singles. In 2007, American Idol alums accounted for 2.1% of all music sales. Its alumni have a massive impact on radio; in 2007, American Idol had become "a dominant force in radio" according to the president of the research company Mediabase which monitors radio stations Rich Meyer. By 2010, four winners each had more than a million radio spins, with Kelly Clarkson leading the field with over four million spins. COUNT 7
QSN1 How many number one Billboard singles were released by American Idol contestants in the shows first decade?  ANS1 345 QSN2 Who is the president of Mediabase?  ANS2 Rich Meyer QSN3 Who was the most successful American Idol winner on radio as of 2010?  ANS3 Kelly Clarkson QSN4 How many number ones have Idol singers achieved on Billboard charts in just the first ten years? ANS4 345 QSN5 Who authored books on Billboard charts? ANS5 Fred Bronson QSN6 How many contestants had at least one million radio spins by 2010? ANS6 four QSN7 How many radio spins did Kelly Clarkson have by 2010? ANS7 over four million