I have no idea how random the audience questions asked on her show are -- I suspect totally, but I don't know. But even if the producers have an idea who they want to pick beforehand, from audience cards the show itself might give people standing in line, I think that's as far as it goes here. Maybe they knew the guy wanted to sing and knew they'd invite him up -- maybe -- but this doesn't appear like he had any clue, nor what he'd ask to sing. What happens is a joy.