In "Tekkohkan", built in Osaka World's Fair 1970, a magnificent sound control system with more than one thousand speakers was installed in order to realize the idea of "spatialization of music" proposed by Toru Takemitsu, a contemporary Japanese composer (1930-96). The original concept was realized here by an interdisciplinary collaboration between a musician, a sound engineer and an architect. The purpose of this paper is to examine the technological features of the sound control system in "Tekkohkan" and to evaluate the possibility of the concept of "spatialization of music".
