When some look toward the U.S. semiquincentennial and consider what examplar might best represent American achievement or the nation’s character, only one thing inevitably comes to mind: wrestling. Fortunately, there were others who put their heads together and came up with an alternative choice: John Prine . The leadership at Wolf Trap, the concert venue/national park in Virginia just outside of D.C., had the idea to have some of the late troubadour’s fellow songwriters salute him in a concert