I think it looks cool, and I like the rainbow effect too. But, did you take a look at some of the titles? Olivia Newton John, Andy Williams, Meatloaf, Glenn Miller, Schumann, Mendelssohn and some opera. I'm thinking the display is more for the visual effect than a bona fide collection.
Please note, I'm NOT criticizing anyone's taste in music. All I'm suggesting is that the collection's breadth seems to be a function of the visual effect wanted. I realize that there are folks (myself included) with eclectic tastes ... but somehow this seems to be born of another reason.