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.
Joshua Allen Joshua Allen (born March 13, 1989) is the winner of the fourth season of "So You Think You Can Dance". He had originally auditioned in Dallas, Texas with his friend and fellow contestant, Comfort Fedoke. Allen was announced winner of the show on August 7, 2008, winning $250,000.