Interesting arrangement of that tune you guys put together and jammed away on there Rick - - Good to hear you do your thing too on that classic jam tune :)
Frank, it was totally ad lib. The singer called the tune and ten seconds later we started playing it. Any "arrangement" was purely accidental or coincidental. I'd never played the song outside a jam and had never before played with that singer.
But it was a lot of fun! And fun is about the best you can hope for at blues jams.