My first instinct was to treat the color scale like a heat map, reds and yellows for bright and fast, and blues and greens for slower music. Though I have to admit, the final results seemed a bit of a mess, I was expecting everyone to "see" the music like I had, but if anything I seemed to be an outlier with my choices. It is an interesting experiment, and I might check back since the results seem dynamic, and see how it changes over time as more and more people take the little survey.