Rubens
I'm just improvising this music, and this is how I want it to sound,
The most vivid experience of this I had was when I awoke one 2AM in the distant past. I still occasionally partook of the wacky weed in those years, and had a few puffs before donning the earphones and sitting at my piano.
I played the Berceuse.
Well, I didn't play it. I watched my hands, and it was as if they belonged to Chopin and he was improvising the most marvelous music. There was no concern about hitting a wrong note. The only thing I did was to listen and work the pedal.
The problem I think so many of us have is the self-consciousness that flits our thoughts AROUND the music that we're TRYING to play. As the green puppet once said, "Do or do not. There is no try." When we're thinking about ourselves or whether we're going to play the next section cleanly or dealing with the slings and arrows, we're disconnected. What I think differentiates the pros from so many of us is their incredible level of concentration.