Hijokaidan (lit. "emergency stairway") 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 Yoshiyuki "Jojo" Hiroshige its one constant member, who is head & owner of the Osaka-based Alchemy Records. 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 white noise created by each member making as much of a racket as humanly possible.