"to sing Utah PhIllips' GREEN ROLLING HILLS OF WEST VIRGINIA. Archie Green, the eminent folklorist, labor historian, and ethno-proctologist turned to Utah afterwards and said that he would introduce Utah as the author of that song. Phillips told him no to, because he was proud to think that his piece could become part of the tradition."

I suspect Utah probably also just didn't want to embarrass the guy. A very noble gentleman was that Mr Phillips.