De Marinis is also known as an electronic music composer, and a recent installation of his was featured at we-make-money-not-art. Personally, I like this one more - it's technically much simpler, but to the point.
Also, I really wouldn't need any music, and think it might fit better in the middle of, say, Lisbon, where the summer heat would be enough of a motivation to dive into the rainbow - no need for umbrellas or such. I know the umbrellas serve as speakers, but it looks like more of a gadget than anything else here, there is something wrong about it in this case. Maybe it's the isolation from the rainbow? Or maybe umbrellas simply have a sad relation with water.