“When you're playing music with a group of people, there are those special moments when it all works, and you're in the groove. As soon as you begin to think about it, you lose it because you've introduced thought, and it's trying to take over. There's something at a lower level, a different level altogether, where all that is happening and working. And I think that's true of the whole body, that sometimes when we start thinking that introduces problems rather than solutions.”