DJ Koo is a Japanese DJ, musician, sound creator, and variety talent. His real name is Koichi Takase (髙瀨 浩一, Takase Kōichi)

He is a member of the band TRF. At the age of 12, he was influenced by British rock and got a guitar. He met dance music when he was in high school. After that he was invited by a senior DJ to work as a DJ at Disco Canterbury House and B & B in Shinjuku.

Making completely new music with computer & MIDI SYSTEM became a hot topic, and in 1986 he formed the Re-mix team "THE JG's" with DJ HONDA and worked on numerous remix productions. His activities expanded at once, and it is now a legend as the strongest Re-mix group in Japan.