It's a very nice, moving performance. But what makes the video is the reaction several times during the song when they cut to his girlfriend in the audience who understands what debilitating stage fright he has and therefore how truly difficult it is for him. And also his continued reaction when the number is over.
Interesting too is how perceptive judge Simon Cowell is before the performance begins, picking up that the fellow isn't just shy, but terrified. And how well Cowell handles it after.