Biography
Supercell is a musical/illustration group from Japan. Ryo is the composer and lyricists of this group. He uses a vocaloid called Hatsune Miku http://en.wikipedia.org/wiki/Vocaloid.
Official website: http://www.supercell.jp
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Official blog: http://supercell.sc
Wikipedia: http://en.wikipedia.org/wiki/Supercell_(band)
Biography text from Last.fm, available under CC BY-SA.