Uematsu himself does perform his songs live with his band "The Black Mages". I believe he plays keyboard, and is accompanied by a drummer, bassist and guitarist, but I'm not sure.
I think he plays the organ and is accompanied by a keyboard player, a bassist and 1 or 2 guitarists but like you im not sure
Originally Posted by darkchrono
I didn't realize that they were played by such a professional orchestral group. On You Tube there is a video of an orchestra playing Aeris (or Aerith's) theme.