aSTARick is a wildly customizable iTunes music visualizer. After installing just press "h" to bring up some handy help.
Decide if you want to install for all users, or just yourself (this may depend on your access permissions). If you want to install for all users the Compositions folder is at /Library/Compositions/. If you want to install for just yourself the Compositions folder is at /Users/yourusername/Library/Compositions/. If the Compositions folder you want is not there, make it now.
Find your new QTZ visualizer (if you need to decompress it, do so now).
Drag your new QTZ visualizer into the Compositions folder.
Under iTunes' View menu select Visualizer. Then select your new visualizer.
Under iTunes' View menu select Turn On Visualizer.
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