...It's a big thing for every musician at some moment to stop concentrating on the fingers and start concentrating on the music.
Interesting article on musician's brain waves...
In my studies of neuropsychology, I've come across many references to the fact that musician's tend to have musically related brain function lateralized differently than the rest of us. Here's an article (from CNN) about another potential difference.
http://www.cnn.com/2001/HEALTH/11/15/musicians.brains.ap/index.html
http://www.cnn.com/2001/HEALTH/11/15/musicians.brains.ap/index.html