There's more than just one band with the same name Yellow. 1. Yellow were a Japanese experimental rock group founded in 1971 by Taisuke Morishita. The group played their first gig at Aquirax Aida's Jiyu Kukan festival in Niigata in April 1972. Following a hitchhiking trip to California in 1974, Morshita decides to change the group's name to Be.
Members: Hiroshi Imaizumi, Hiroyuki Takahashi, Taisuke Morishita (from Wikipedia)
Yellow had no released output while they were active. Some live recordings appeared several years later, in Dead Flower's "Underground Tracks 70’s" compilation.