I caught that. I really enjoyed most of it. Eric Clapton was great! Also enjoyed Ray Charles and Leon Russell. Norah Jones looked like she was enjoying it. Diana Krall picked a good song for her style (was it "Crazy"? my memory is bad) I think Willie has jammed with just about every musician on earth?
Willie's my man. I drove from Michigan to Texas for his 1975 4th of July Picnic and ended up moving to Austin once I realized what a great music scene they had.