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"01_ballade" is a song featuring Hatsune Miku by Eiji Hirasawa. It is Hatsune Miku's first demo song. A full version, "Hoshi no Kakera" (Fragments of a Star), was later made. "01_ballade" has received unofficial extended versions and covers. According to an interview, this was the first time the composer, Eiji Hirasawa, had ever written lyrics, and that he never really thought about being the first Miku producer. (from Vocaloid wiki)
