Question: What singer made appearances during Keith Urban's Ripcord World Tour who also the winner of the  fourth season of "American Idol"?
Sentence (from "Bo Bice"): Harold Elwin "Bo" Bice, Jr. (born November 1, 1975) is an American singer and musician who was the runner-up against Carrie Underwood in the fourth season of "American Idol".
Relevant evidence: No