A musician knows hit material. It has to feel right. Everything has to feel in place. It fulfills you and it makes you feel good. You know it when you hear it.
I'm actually relaxed onstage. Totally relaxed. It's nice. I feel relaxed in the studio too. I know whether something feels right. If it doesn't, I know how to fix it. Everything has to be in place and if it is you feel good, you feel fulfilled.