Look, I'm supposed to be on vacation today, so let's not make this any harder than it has to be. The theme of Katamari Damacy is a no-brainer for GMOTD - the Katamari series has consistently amazing soundtracks. I don't think there's even a single so-so song in the entire Katamari catalog.
The OST for Katamari Damacy, called Katamari Fortissimo Damacy, pulls from a wide variety of musical influences (jazz, samba, J-Pop, traditional VGM), but still manages to be totally cohesive. It's catchy and energetic, and while not quite as wacky as the gameplay itself, definitely inhances said wackiness. Katamari on the Rocks is a great representation of the cheery spirit of Katamari's music.
Above: And of course, Dokaka's beatbox version from We Love Katamari. There's also this beautiful instrumental version
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