“Simple Pleasure”, an Mac iTunes Visualization build with Quartz Composer and this great iTunes plugin iVisualize. I always thougt i ‘have to improve this “vis.”, but it is fine like it is.
You have to install iVisualize

(get it from the developers site here ) and place this Quartz Composition under: /Library/iTunes/iVisualize (or the safer way under: /Users/(yourUserNameHere)/Library/iTunes/iVisualize/ )
If you need to know more about Quartz Composer look here.