Sou Matsumoto (b. December 22nd, 1978) is a member of the rock band GOING UNDER GROUND. He is from Okegawa City, Saitama Prefecture.
On top of composing and writing lyrics for the aforementioned band, he has provided songs and lyrics for THE COLLECTORS, KinKi Kids (lyrics only), Fumiya Fujii, Masatoshi Nakamura, Takako Matsu, and MEG. He has also performed as DJ at events such as ROCK IN JAPAN FESTIVAL.
In the summer of 2009, began his solo project “SxOxU”(read Sou).
Official Website: http://www.aquamusic.co.jp/soumatsumoto/