is a Japanese keyboardist and music producer who has worked with artists such as eX-Girl, The Pugs, Bradford Reed, Bill Laswell, Jan Linton, Marc Ribot, Hugh Hopper/Elton Dean and Damo Suzuki.
His record company, God Mountain, was named after the English translation of his family name.[1] God Mountain was established in 1993 after his frustration with EMI pulling two of his albums from sale.[2]
Kamiyama cites Mauricio Kagel, Luciano Berio, Iannis Xenakis and Karlheinz Stockhausen as his influences – artists with a "bizarre sense and distorted feel and touch".[3]
His nickname is derived from Hoppy, a cheap Japanese liquor that he drank during his early professional musician days.[1]