I have an old bookmark that I tried to follow today (
http://heven.pwp.blueyonder.co.uk/flash/drums.swf). That entire website is gone, so don't bother following that link. I want to find it again, but my Google skills fail me.
The animation was a bunch of mushrooms in a semicircle, each with its own drum. The pattern became more and more complex as more mushrooms added their rhythms to the mix. There was also some round spinning thing with gnashing teeth towards the end of the animation.
Can anyone help me?