File contains correspondence with: Frances (James) Adaskin, Murray Adaskin, Bill Aide, Anne Aitchison, Istvan Anhalt, Robert and Mary Ashley, Stanley Lunetta, Larry Austin (Source magazine), John Beckwith, Michael van Biel, George Caccioppo, Barney Childs, Oliver Daniel, Marvin Duchow, Judith Dunn, Morton Feldman, Dick Higgins, Harold Henderson, Otto Joachim, Burton Kaplan, Karl Kohn, Ernst Krenek, Brian Longworth (student composer at McGill), Alvin Lucier, William Maraldo, Edward Miller, John Mills-Cockell, Gordon Mumma, Roger Reynolds, Gardner Read, Raymond Rendall, George Rochberg, Donald Scavarda, Murray Schafer, Harry Somers, Bertram Turetzky, Aurelio de la Vega, Raymond Wilding-White, Eugene Wilson, and Klaus van Wrochem.