What singer made appearances during Keith Urban's Ripcord World Tour who also the winner of the  fourth season of "American Idol"?
Carrie Underwood Carrie Marie Underwood (born March 10, 1983) is an American singer, songwriter, and actress. She rose to fame as the winner of the fourth season of "American Idol" in 2005. Her debut album, "Some Hearts", was released in 2005. Bolstered by the huge crossover success of the singles "Jesus, Take the Wheel" and "Before He Cheats", it became the best-selling solo female debut album in country music history, the fastest-selling debut country album in Nielsen SoundScan history and the best-selling country album of the last 14 years. Underwood won three Grammy Awards for the album, including Best New Artist.
Scotty McCreery Scott Cooke "Scotty" McCreery (born October 9, 1993) is an American country music singer. He won the tenth season of "American Idol" on May 25, 2011. His debut studio album, "Clear as Day", was released in October 2011 and was certified platinum in the United States. The album includes the top 20 country songs, "I Love You This Big" and "The Trouble with Girls". McCreery released a Christmas album, "Christmas with Scotty McCreery", in October 2012 and it has been certified gold. He released his third album, "See You Tonight," in October 2013. The first single from the album, also called "See You Tonight", became his first song to reach the top ten on "Billboard's "Country charts.