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Seiji Matsunaga aka DJ Matsunaga was born in Ibaraki, Japan in 1977. He has been actively DJing since 1999. He formed the Japanese trance duo called "The Originators" with his friend Hiroaki Ueda in 2003, and started producing tracks.
In 2004,DJ Matsunaga started the independent label called "Sevensenses Recordings" with Hiroaki and their friend "DJ Yummy".