Letterman is very intimidating because he's so funny, so you have to be really prepared. Also, he's a little squeamish about certain things, so you have to always be on guard to please him.
Even as a little child, I've always had that comedian kind of attitude.
You can't fake this music. You might be a great singer or a great musician but, in the need, that's got nothing to do with it. It's how you connect to the songs and to the history behind them.
Once you lose the weight, you're really anxious to eat healthy.