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Re:MusicBox: a truly powerful visualization of your music li... by nickb on Tuesday December 16, 2008 @01:44AM (#399293)
From the thesis:

MusicBox is written in Java 6, and uses Processingfor drawing the visuals. Its dependencies are written in Python (for creating the cached soundsieve thumbnails) and Perl (for uploading and retrieving analysis result files from The Echo Nest). Audio analysis depends on The Echo Nest Analyze API [56] and Rhythm Histogram Matlab code from the Vienna University of Technology . Jonathan Hilliker created the icons used for the playlist playback buttons.

The Echo Nest (the.echonest.com) seems to be the classification engine that makes it possible.

Re:MusicBox: a truly powerful visualization of your music li... by atarashi on Tuesday December 16, 2008 @03:03AM (#399334)
The Echo Nest was co-founded by a member of her group at the media lab.