[bishnu]

This is a good start, I'd be more interested if these chord patterns were compared against a database of UNpopular songs to see if the what sort of differences in chord distribution correlated with popular songs (although where you'd find that, I do not know). It's difficult to understand what this really quantifies - all the "2nd chord" distribution suggests to me at this point is that there's a large difference between actually playing music vs a random sequence of chords. It's good that you're recapitulating that at least, but not really a striking observation.

Regardless, I will be keeping tabs on this. Hah, totally didn't intend that pun.