The series consists of records pertaining to the musical activities and administration of the McGill Chamber Orchestra, one of the most important chamber orchestras in Canada, and of its predecessor, the McGill String Quartet. It contains, among other items, correspondence (Jan Simons, Zara Nelsova, Martial Singher, Igor Markevitch, Sir Thomas Beecham, Wilfrid Pelletier, Joseph Szigeti, Leonard Rose, Lili Kraus, Jean-Pierre Rampal, Rosalyn Tureck, E. Power Biggs, Gary Karr, Alexandre Lagoya, Jean-Paul Sévilla, Vlado Perlemuter, Jeffrey Siegel, Glenn Gould, Maurice Gendron, Robert Fizdale, Claude Frank, Gerald Wheeler, John Newmark, Philippe Entremont, François D'Albert, John Carewe, Maureen Forrester, Janos Starker, Julius Baker, William Primrose, Jörg Demus, Alfred Prinz, Benny Goodman, Donald Bell, Larry Adler, Antonio Janigro, Kelsey Jones, Dietrich Fischer-Dieskau, John van Kesteren, Ravi Shankar, Pierre Fournier, Igor Kipnis, Sir Yehudi Menuhin, André Laplante, Gérard Souzay, Mstislav Rostropovich, Barry Tuckwell, Yuli Turovsky, Murray Perahia, Rudolf Serkin, Chantal Juillet, Scott Ross, James Galway, Elly Ameling, Franco Gulli, Jaime Laredo, Karen Kain, Yo-Yo Ma, Lynn Harrell, Leonard Bernstein, Justino Diaz, Uto Ughi, Itzhak Perlman, Anton Kuerti, Marilyn Horne, Matt Haimovitz, Daniel Taylor, 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.