A native of Hiroshima, Hosokawa studied piano and composition in Tokyo as a teenager. He continued to study while living in West Berlin between 1976 and 1986. The artistic director of the Akiyoshidai International Contemporary Music Seminar and Festival since 1989, Hosokawa returned to live in his birthplace in 1994.
Hosokawa's masterpiece is his composition, In Die Tiefe Der Zeit (Into The Depths Of Time), written for cello and accordion. Initially featured on an album shares with avant garde composer John Cage, the piece was later featured on an album recorded by viola player Nobuko Imai and accordionist Mie Miki. According to Hosokawa, the viola "symbolizes the male principal, the accordion a sympathetic response to that voice, a fertile womb embracing it." ~ Craig Harris, Rovi