Takashi Seo started as a jazz basist, won the grand prix of Yokohama Jazz Promenade Competition in 2006, with Mikio Ishida trio. Since then he has been playing with many musicians such as Fumio Itabashi (pf), Aki Takase (pf), Tetsu Saito(Cb), Eiichi Hayashi (sax), Yukihiro Isso(Noh musician), Yoriyuki Harada(pf), Daisuke Takaoka(Tuba), Akira Sotoyama(ds), Syota Koyama(ds), Min Tanaka(dance), Jean Laurent Sasportes(dance), Leona(tap), performed in many music festivals such as Yokohama Jazz Promenade, Singaporean WOMAD, RISING SUN ROCK FESTIVAL in EZO, PERCPAN(Rio de Janeiro,Salvador),ASIAN IMPROVISATION ART EXCHANGE2010(Seoul), International society of BASSISTS Convention 2013(Rochester. NY). Also he presides over a contrabass ensemble “Teigen” by more than 10 bassist since 2003, including Hideto Kanai, Nobuyoshi Ino, Tetsu Saito, and continues collaboration with not only jazz but also free improvisation and baroque music, world music, dance and art.