Fox reality chief Mike Darnell says the network's much-hyped tweaks to the "American Idol" formula are behind the show's solid ratings debut this week. "The creative is working," Mr. Darnell said Thursday. "People like [new judge] Kara [DioGuardi]. The word of mouth is...
Fox says it is adding a fourth judge to "American Idol" next year. Kara DioGuardi, a Grammy-nominated songwriter, will join Simon Cowell, Randy Jackson and Paula Abdul on the talent search. The show's ratings slipped last season. "We are turning the heat up on 'Idol' this year...