John, how fortunate to have seen Diana perform that song. For me it was the highlight of the Joni Tribute. I can't imagine it getting much better than that - but a ten minute version - Wow! I've always been a bit disappointed in Diana's albums, especially after seeing what she is capable of with a song like A Case of You. Given the right material, and the right setting (her alone at the piano), I think she would be amazing.
Congrats on experiencing such a magical moment. Now when is she coming to Chicago? Jack