Kz collaborated with manga artist Masami Yuki to produce the concept album Crosslight released on August 26, 2009 containing tracks sung by Hatsune Miku and Vocaloid 2 Gumi.
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Following the release of the Vocaloid 2 singing synthesizer software Hatsune Miku on August 31, 2007, Kz submitted a short version of the song "Packaged" to the Nico Nico Douga video sharing website on September 21, 2007 using Miku for the vocals.
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The popularity of the songs led the group to release the independent album Re:package at Comiket 73 in December 2007.
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Livetune started out by making use of the Hatsune Miku singing synthesizer to produce vocals for songs submitted to the Nico Nico Douga video sharing website.