H ZETT M is a Japanese pianist/keyboardist/composer/singer and graduate of the Kunitachi College of Music Composition Department. His real name is Hiizumi Masayuki.
Until 2005, he was performing with Shiina Ringo and Shiina's other musical project, Tokyo Jihen under the name Tadashi M.
H ZETT M's keyboard playing style is a very aggressive and uses sound to represent the whole body, and mixes elements of classic rock, jazz with the Latin and even hip-hop feel.
http://www.worldapart.co.jp/hzettm/
http://korgc383.tempdomainname.com/