The sub-series consists of records pertaining to the musical activities and administration of the McGill Chamber Orchestra for the seasons 1951-1952 to 2003-2004. It contains, among other items, correspondence (Geoffrey Waddington, Leonard Isaacs, Jan Simons, Ellen Ballon, Zara Nelsova, Martial Singher, Ross Pratt, Mario Duschenes, Pierre Mercure, David Nadien, Otto Joachim, Healey Willan, Oskar Morawetz, Igor Markevitch, Sir Thomas Beecham, Pierrette Alarie, Léopold Simoneau, Wilfrid Pelletier, Jean-Paul Jeannotte, Joseph Szigeti, Leonard Rose, Lili Kraus, Jean-Pierre Rampal, Rosalyn Tureck, E. Power Biggs, Robert Verebes, Clermont Pépin, Gary Karr, Alexandre Lagoya, Steven Staryk, Jean-Paul Sévilla, Vlado Perlemuter, Jeffrey Siegel, Glenn Gould, Maurice Gendron, Robert Fizdale, Claude Frank, Gerald Wheeler, Claire Gagnier, John Newmark, Philippe Entremont, François D'Albert, John Carewe, Marek Jablonski, Berj Zamkochian, Maureen Forrester, Janos Starker, Julius Baker, William Primrose, Walter Trampler, Jörg Demus, Claude Garden, Alfred Prinz, Benny Goodman, Donald Bell, Larry Adler, Antonio Janigro, Kelsey Jones, Dietrich Fischer-Dieskau, Colette Boky, John van Kesteren, Christopher Plummer, Geneviève Bujold, Ravi Shankar, François Morel, Pierre Fournier, Jean-Jacques Kantorow, Igor Kipnis, Sir Yehudi Menuhin, André Laplante, Otto Armin, Gérard Souzay, Mstislav Rostropovich, Barry Tuckwell, Yuli Turovsky, Murray Perahia, Rudolf Serkin, Peter Ustinov, Chantal Juillet, Scott Ross, James Galway, Elly Ameling, Franco Gulli, Angèle Dubeau, Alain Trudel, Jaime Laredo, Alain Lefèvre, Gheorghe Zamfir, Karen Kain, Josef Gingold, Yo-Yo Ma, Lynn Harrell, Leonard Bernstein, Luc Devos, Justino Diaz, Uto Ughi, Itzhak Perlman, Anton Kuerti, Louis Quilico, Marilyn Horne, Matt Haimovitz, Daniel Taylor, Suzie Leblanc, Andrea Griminelli, David Oistrakh, etc.); contracts; minutes of meetings; schedules; itineraries; financial records; grant applications; draft and final concert programmes; promotional material; guest lists; press clippings; photographs of performances, events and various artists, including Enrico di Giuseppe, John Williams, Maureen Forrester, Itzhak Perlman, Mstislav Rostropovich, Shura Cherkassky, Victor Borge, Gil Shaham, Christian Zacharias, Marc-André Hamelin, Israela Margalit, Daniel Taylor, Rudolf Buchbinder, Vladimir Feltsman, Henriette Schellenberg, Marilyn Horne, Yo-Yo Ma, Leontyne Price, Jerome Lowenthal, Maxim Vengerov and David Oistrakh.