fripSide is a Japanese pop and trance duo originally formed by composer Satoshi Yaginuma (Sat) and singer Nao in February 2002.In a 2008 interview, Satoshi said that he was a fan of TM Network and its member Tetsuya Komuro in his elementary and junior high school days and began to produce his music at the age of 14.When the group started, they were releasing their songs on the Japanese amateur and indie community, Muzie. fripSide's albums were always high in sales at Muzie's online CD shop. As of July 2006, more than 6,000 copies of the three original albums have been sold.

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