[youtube http://www.youtube.com/watch?v=9qo2uhNRJok]
"Skit-Dat-De-Dat is a very good and interesting study of 6-8-10 bar phrases of contrasts with 2 bar fill-ins by pianist, in between, for player to take breath before each new and good attack. This solo starts by long whole notes, with a gradual change to the rhythmical pattersn which delight player and listener."
According to Joe Oliver and Kid Ory, the very earliest improvisations were slow evolutions, small changes on each chorus moving progressively farther from the tune both rhythmically and melodically.