I think it's a host of things and much of it can be seen in the Itunes gig. For one thing his mic might be a bit higher and rather than bending over using all of his back, he's bending his legs more. This makes him much less hunched over. In the Itunes gig there are many more instances of him standing straight and tall, in a confident position where he's projecting. So he's really attacking the mic vocally.

Another thing is that he's moving a bit more and also there's more eye contact with the audience. I think the things that we see with our eyes many times influences what we hear and when someone looks confident when they're singing, then that does help in our perception of how they sound.

Vocally I think he is more confident than he was at the beginning of this tour. I think he was so concentrated on giving good vocal performances from night to night that it might have taken a bit of fun out of it and made him a bit more tense. I think that now that he's been doing it for awhile, he's been a lot more looser, less tense, and more confident, and it comes through in his vocals and overall performance.