http://www.turbulence.org/Works/song/mono.html

The Shape of Song is a way of visualizing music that reveals repetition within a track. It’s an interesting way of profiling a song and revealing the underlying data, and the implementation uses arcs for some pretty cool looking shapes. Unfortunately, the visualization is static–when I ran it for the first time, I really expected the visualization to be generated as I listened to the song, and I was a little disappointed when it was already there.