chickenonaunicycle: The Matrix

JGBP: Matrix, 3138 Fillmore, San Francisco, CA

rockprosopography101: Matrix I: January-June 1970 Performers List; Matrix II: July-September 1970 Performers List; Matrix III: October-December 1970 Performers List

JGMF: The Demise of the Matrix, 1971

deadsources: 1969: The Matrix — Raymond Lang (Daily Californian, July 15, 1969); Raymond Lang (Daily Californian, August 15, 1969); unknown (San Francisco Good Times, 9/11/69, p.4)