"The clever way in which he stages the film acknowledges the fact that he knows he's chronologically older than the perfect age to play this part, and he sings the songs himself because he CAN - his voice is more than serviceable; in fact when I saw the trailer for the first time a few months back and heard him singing Mack The Knife I was in the theatre telling the person I'd come with "That's Bobby, that can't possibly be Kevin Spacey" - this from a person who has listened to Darin's recording of that song literally hundreds and hundreds of times"