Drifft -- Live Spectrum Analyzer

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Drifft is a program that listens to audio input and displays a live, scrolling spectrogram.

Using in conjunction with iTunes is well worthwhile, though a bit of hassle.  The idea is to split the audio output, and loop one wire back to audio input.  For a few bucks you can get these attachments from (e.g.) Radio Shack:
(click to enlarge)

Download & Install (Mac OS X)

Installer --  Support libraries-- you can throw it away after you run it.

Drifft --  the application.

Fughetta --  Install this (free) font to get the pretty clefs.


There isn't a manual yet; existing documentation is in the tooltips. 

You should also see "Reading Music Images"--  it's short.