Thanks for sharing Ray, that was an interesting read. I was listening to Michael Jackson's demos from Off The Wall earlier, it's really cool to see the difference between the demo and the finished product as well as the similarities. It's too bad they're on their way out.
Demo for Don't Stop Til You Get Enough, with the intro explaining the "assorted percussion"
(cowbells,
glass bottles, etc)
<iframe src="http://www.youtube.com/embed/PQjAq9JUbuc" allowfullscreen="" frameborder="0" height="315" width="420"></iframe>
The finished product
<iframe src="http://www.youtube.com/embed/ZorRGrDiMsA" allowfullscreen="" frameborder="0" height="315" width="420"></iframe>