I think Susumu Hirasawa is one of the greatest composers of all time. Combining various elements of traditional music from around the world with the avant-garde, he has created an incredible discography, both as a leading man and a solo artist. My favorite albums are (oddly) The Ghost in Science and the self-titled album by P-MODEL. Some other favorites include Vistoron, Virtual Rabbit, Switched-On Lotus, KAI=KAI, Big Body, Gipnoza, and the error CD... but I am a fan of almost all of his work.