There was a discussion a few months ago on here about that clip. I said at the time I thought it was Peak Moz (in every respect). It does indeed give me goosebumps, every time I watch it (and I've watched it many times). I also feel frightened for him every time that he's not going to hit that top note. It always strikes me how vulnerable he looks, and how much courage that performance must have taken to be so exposed like that on live TV.