The "R Kelly" thread reminds me of a thing I wrote after XKCD's Na comic. This also uses graphviz to generate SVGs showing the path through a song's lyrics. Lighter coloured blobs are more frequently mentioned, and there's an option to compare two songs for similarities in their lyrics.
Could you post links to the raw data? It'd be great for generating new songs via Markov chains!
I could if I stored them. I should really do that. If you append .dot to the name of the svg file, then you can grab the raw graphviz file.. There's no database behind it all really.. I didn't think that far ahead (and largely forgot about it until just now).