"We Love Katamari" is the title of a game soundtrack compilation, not the name of an artist. The compilation consists of music written by various artists for the game Katamari Damacy.
The soundtrack album details can be found here: We ♥ Katamari Original Soundtrack (http://www.last.fm/music/Various+Artists/We+%E2%99%A5+Katamari+Original+Soundtrack).
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