generate questions: The finalists were Cook and Archuleta. David Cook was announced the winner on May 21, 2008, the first rocker to win the show. Both Cook and Archuleta had some success as recording artists with both selling over a million albums in the U.S.
Who won season seven of American Idol? {sep_token} Who was the first Rock and Roll artist to win American Idol? {sep_token} When was the winner announced? {sep_token} Who was the winner?