Via RollingStone.com:

"Most every show on U2's 360 world tour has ended with "Moment Of Surrender," but before walking offstage last night in Nashville Bono saw a blind fan upfront holding up a sign saying he wanted to play a song for his wife. "What do you want to play?" Bono said to him. "Get a guitar for this dude. Gents, we have a surprise guest."