What is "hijokaidan"

is a Japanese noise and free improvisation group with a revolving lineup that has ranged from two members to as many as fourteen in its early days. The group is the project of guitarist , its one constant member, who is head and owner of the Osaka-based Alchemy Records. Other regulars include Jojo's wife Junko and Toshiji Mikawa (also of Incapacitants).

The group began at the very end of the 1970s as a performance art-based group whose anarchic shows would often involve destruction of venues and audio equipment, food and garbage being thrown around, and on-stage urination. As the group's lineup changed over time, their focus became less performance-based and more musically based, fine-tuning their sound into a dense wall of noise.