The minute you make a mistake - that's improvisation!
You have to enjoy playing. The old-timers did, and that's one reason why their music is a lasting music. I feel that I play jazz to entertain the listener, and you just can't do that unless you yourself are entertained at the same time.
Endings must come naturally, you're supposed to let it happen, not just to make it happen like that.
There are a lot of things I'm proud of, but the proudest have yet to come.
