I know - I love their Calfornia Jam performances too. I wonder if they were nervous, because as you said, they sure don't look like they were. I can't wrap my little brain around standing up and performing in front of even 2,000 people now. I still remember how I almost got violently ill standing up in front of 20 people to deliver my first speech in my college public speaking class when I was about 20 years old.