First, let me say I am not crazy or high and not everybody may understand what I am posting, but some will.
If you play with a group of people that connect, really connect, I have had the experience of an out-of-body sensation where I actually float above the performance and become a viewer/observer of my own performance. I am not thinking about what notes I am playing, or where I am in the form, I am the music at that moment, in the moment, as conscious as I have ever been.
I happens very rarely, but when it does, you know you are playing in the right band, playing the right music.
Tell me if anyone else knows what hell I am talking about.