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.
Raise 'Em Up Tour The Raise 'Em Up Tour was the ninth headlining tour by Australian country music singer, Keith Urban. The tour was in support of his eighth studio album, "Fuse" (2013). The tour began on 12 July 2014 in Calgary, Canada and ended on 7 September 2014 in Wheatland, California.