American Idol (season 4) numbers for the contestants. The result show was moved to Thursday." The compilation album for this season was performed by the top twelve finalists. "Source: Idolsmusic.com" American Idol (season 4) The fourth season of "American Idol" premiered on January 18, 2005 and continued until May 25, 2005. It was hosted by Ryan Seacrest. Randy Jackson, Paula Abdul and Simon Cowell also returned to judge. Carrie Underwood won the season with approximately 500 million votes cast in the season and 37 million for the finale. Underwood has since gone on to become a seven-time Grammy-winning country megastar. While in the past
Randy Jackson was later decided that he would remain as a judge for season 12. On May 9, 2013, Jackson announced that he would be leaving "American Idol" after twelve seasons due to him wanting to focus on other business ventures. On September 3, 2013, it was announced that Jackson would replace Jimmy Iovine as the in-house mentor on "American Idol". He departed the series for good in November 2014. Jackson produces "America's Best Dance Crew", an American group dance competition and reality television show, which premiered on February 7, 2008 on MTV and was cancelled in 2010 due to declining ratings.