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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.
Re:MusicBox: a truly powerful visualization of your music li... by mynameishere on Tuesday December 16, 2008 @01:10AM (#399269)
beats per minute, length, tone, and a whole bunch of other semi-tangible quantities

Not once have I ever gone through my collection looking for a song fitting any of the above particular qualities. Maybe some have, but when Pink floyd, the Clash, and Beethoven can occasionally aggree on BPM, it becomes a distinctly useless metric.

Re:MusicBox: a truly powerful visualization of your music li... by mullr on Tuesday December 16, 2008 @01:18AM (#399275)
But for a DJ looking to beat match songs, it's a pretty important thing.
Re:MusicBox: a truly powerful visualization of your music li... by Hast on Tuesday December 16, 2008 @08:35AM (#399462)
The point is that those are metrics which the computer uses to classify the music. You can then find similar music which may not be obvious at first. (Just look at the video to see examples.)