Very nice! Random suggestion, how about you turn the background color of the page to the avg color/most popular color people picked for the song when displaying the results.
That seems more likely to lead people (not sure which way though). For example if a song had a dark background (because of previous choices) then people might choose a contrasting background, etc..
It would be interesting to match up after a while with a similar project using "mood words" to create a map of mood to colour which could be broken down by region, by music preferences and such.
It would be interesting to match up after a while with a similar project using "mood words" to create a map of mood to colour which could be broken down by region, by music preferences and such.