I created a similar visualization of part of HookTheory's data: http://briancort.com/songviz/ http://briancort.com/songviz/ At the time they didn't have an AP

I created a similar visualization of part of HookTheory's data: http://briancort.com/songviz/ http://briancort.com/songviz/ At the time they didn't have an API, so I emailed them and they sent me a sample to work with. Would be interesting to see how it handles such a large amount of data. If you're interested in this sort of harmonic analysis, you might also like a little visualization I created of the harmonies within a chord: http://briancort.com/chordviz/ http://briancort.com/chordviz/ Great minds... ;)