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.
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.