U2 at Vanderbilt Stadium, 7/2/11

Given the mid-show shout-outs U2 singer Bono made to Nashvillians and philanthropic allies like Michael W. Smith, Dierks Bentley and Bill Frist, as he and his bandmates took their final bows at the end of Saturday's sold-out show at Vanderbilt Stadium, we felt lucky to have made it through the night without the onstage appearance of any special guests.

Not so fast. Immediately following those bows, Bono turned around and pointed to a front-row fan holding a sign reading "Blind Guitar Player."

A moment later and Adam Bevell, of Mesa, Ariz., who proclaimed to a roar of laughter, "I'm real nervous, man!" was leading his heroes, along with an accompanying chorus of 45,000 of his fellow fans, through a rousing surprise encore of the 1988 Rattle and Hum hit "All I Want Is You" before making off with Bono's guitar. And … he's blind. Literally.