Question: The seventh season of American Idol, the annual reality show and singing competition, began on January 15, 2008, David Cook was announced the winner of the competition on May 21, 2008, defeating who, which American singer-songwriter, musician, and actor, as runner-up?
Sentence (from "American Idol"): The concept of the series involves discovering recording stars from unsigned singing talents, with the winner determined by the viewers in America through telephones, Internet, and SMS text voting.
Relevant evidence: No