I caught a bit of a show about Jazz that talked about how jazz musicians follow a structure and improvise over that structure, at times trading 4 measures at a time. Giving the drummer some. The piano some. I was reminded of a conversation I had with Dorie, a friend from the past, while in an altered state we listened to Jazz at CB Gallery 303. I made this amusing observation at the time that jazz was a wonderful imitation of life. We all move along the groove -- the rhythm and melody -- and now and then we get to come out of the groove and do our thing. We improvise and trade measures. You should hear some of the other interesting observations I've made while in such a state. I once came up with a formula to describe backgammon.