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.
Amanda Ayala Amanda Ayala is an American singer from New York who made her first appearance on the national scene on NBC's Emmy Award-winning show "The Voice." Her first performance on the show was a rendition of Mississippi Queen by Mountain (band). Three out of the four judges on the panel turned their chairs for Amanda, including Pharrell Williams, Blake Shelton and Adam Levine. Ayala chose to join Team Adam where she was mentored by John Fogerty. Amanda also performed a rendition of Edge of Seventeen by Stevie Nicks. Both of Ayala's singles charted on the iTunes Rock Charts. Her performances garnered attention from stars like Brad Paisley and Leslie West via Twitter. Her audition video has over 1.2 million views and counting.