A couple of people sent me this link today: Song Visualizations with Echo Nest.These are song plots made using the Echo Nest Analyze API. They are quite aesthically pleasing. As the creator, Chris Mueller points out, the plots are similar to those that Anita created with the music box. In addition to the pitch plot, Chris includes a plot of the volume change over the course of the song. (It might be nice to low-pass filter the volume to make it smoother). These are very nice song visualizations. Well done.
Philip Glass String Quartet #5, 2nd Movement
After you check out the Song Visualizations, be sure to check out the rest of the blog. Chris has some great posts about subway maps (little known fact, I have a London Tube map with music artists superimposed on all the stations hanging in my kitchen).
Tube Map of music
(shhh, don’t tell anyone, but a secret spare time project of mine is to recreate this map properly, so that the artist relations reflect reality, and the artist popularity is proportional to a stations popularity … I have all of the artist relation data (thanks to the Echo Nest), I just need the tube connectivity graph and station data).
Music Machinery 
#1 by Ben on March 20, 2009 - 6:58 am
Why restrict yourself to the London Underground? Generating a subway map for ‘Music City’ might be a fun and interesting project in itself (having to analyze other cities’ layouts to find patterns, and such).