In 1993, Kazuyoshi Saitou began his career in the music industry with the release of his single "Boku no Mita Beatles wa TV no Naka". Following this, he started writing songs for commercials and collaborating with artists such as PUFFY. He also appeared on television shows like Yoru no Rock Radio on Fuji TV, where he performed his own version of Harada Shinjis "Candy" on the piano. Many artists have covered his songs, including Bank Band, alüto, and Ooyama Yurika covering "Aruite Kaerou". Additionally, he has composed and written music for artists like Isa Koutarou and movies like FISH STORY (2008).