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.
Quentin Alexander Quentin Alexander ( years old) is an American singer and artist from New Orleans, Louisiana. In 2015 he came to national attention competing on 14th season of singing talent reality show "American Idol" both for his soulful vocals and "his original fashion sense - head scarves, furry jackets and all." After finishing in sixth place he plans to continue film and fashion projects that were in process before he was chosen for the show as well as performing.