What singer made appearances during Keith Urban's Ripcord World Tour who also the winner of the  fourth season of "American Idol"?
Ripcord World Tour The Ripcord World Tour (stylized as the ripCORD World Tour) was the eleventh concert tour by Australian singer Keith Urban. The tour was in support of his tenth studio album "Ripcord" (2016). The tour began on 2 June 2016 in Bonner Springs, Kansas and concluded on 17 December 2016 with two shows in Brisbane, Australia. Brett Eldredge, Maren Morris and Dallas Smith were supporting acts for Urban in North America. The Oceania leg of the tour was co-headlined with American singer Carrie Underwood, with Buchanan as opening act.
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.