We Love Katamari 「Disco Prince」 

Disclaimer: This song is copyrighted by Namco, therefore, I do not own this audio.
It's funktastic! They also sing one part of the lyrics from The Moon and the Prince.
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Song Name: Disco Prince
Artist: Kenji Ninuma
Game the Song Came From: みんな大好き塊魂 (Minna Daisuki Katamari Damashii) [We Love Katamari]
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Image came from...
My own We Love Katamari game booklet.