The stream doesn't play for me as well, but I get the idea. And I think it's a great idea.
What do you plan to do with the collected data? It would be interesting to see whether there is a consensus among many people on what color some songs are or if it's more or less random.
If there is a consensus, it would probably reflect our culture's current associations with each color. It would be very interesting to see an analysis of that data.
Another idea: You could compare the colors with the cover art of the respective albums to see if there are matches.