pectroGraph is a visual plug-in for iTunes for Mac OS X. Visual plug-ins were introduced in version 1.1 of iTunes. The plug-in started life as a simple modification of Apple's iTunesXPlugIn sample code, but has grown beyond that in newer versions. Of course it's completely free!
The plug-in displays a plain spectrogram (hence the name) of the music. A spectrogram is a graph of the frequency content of a sound in function of time. The left channel is plotted in red, the right channel in green. This means that a mono sound will show up in pure yellow (because in RGB space, red green = yellow).
I made this plug-in because I needed something which represented the actual spectrum of the sound as realistically as possible. Amidst the existing visual plug-ins for iTunes, I only found funny gizmos which produce a fancy display which moves to the music. That's nice to look at, but not handy if for some reason you need an accurate display of the frequency content of the music.
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