American Idol winner David Cook and his runner-up David Archuleta talk about the latest about American Idol. They both agreed on the rumor that Kara DioGuardi who is an American songwriter, producer and a singer as well who did Celine Dion, Kylie Minogue and Christina Agilera songs among others (to those who doesn'tknow her) will be the fourth judge on the latest season of American Idol. But while this decision is still being finalized behind the scenes. the two Davids did a concert together for the American Idols's Live Tour. Both David Cook and David Archuleta have albums coming out this November.