Back in the 70's we had tickets to see B J Thomas at Iowa State. His child got sick so he flew home and they brought in some guy from MPLS. We could get a refund or stay and see this guy named John Denver. We'd never heard of him but had nothing else to do so we stayed and it was the best concert. He was dressed in a Tshirt and blue jeans just sat on a stool with his guitar and sang. I saw him 3 times but that was the best one.