abstract:Ongaku was a free improvisation musical group begun in 1958 by Takehisa Kosugi and Shukou Mizuno, two students at Tokyo National University of Fine Arts and Music. They were soon joined by other music students Chieko (Mieko) Shiomi, Mikio Tojima, Genichi Tsuge, and Yumiko Tanno, as well as Yasunao Tone from the Department of Literature at Chiba University.