Paul Helmer’s "Growing with Canada" Collection constitutes an important resource for research in Canadian music and culture of the twentieth century. Canadian music and culture of the twentieth century. The Collection has been divided into seven series and contains approximately 1 140 items. Of particular interest are the edited interview transcripts (S.1 and S.7, available in print and .pdf, respectively), which Dr. Helmer had intended Paul Helmer Finding Aid Page 3 of 18 17 July 2014 as the second volume of his project. The Collection also contains the raw material for these edited transcripts: namely, the unedited transcripts and audio recordings themselves, as well as biographical information for each “émigré” musician discussed (with correspondence, copies of source material and photographs), copies of primary and secondary sources on immigration and internment, and miscellaneous items, including correspondence, unused research materials and notes relating to the book launch for "Growing with Canada".

The Sonde Collection provides a thirty-five year span of documentation for a Montreal-based Canadian experimental musical group who were very active electroacoustic composers and performers in the 70s and 80s. Sonde (formerly named MUD, Musical Design), created and played sound sources in Quebec, Canada and Europe. Sonde’s compositions were generally conceived for live performance on original sound sculptures. Using meditative improvisation, the group produced new music with sounds created by electroacoustic amplification and transformation.
The Sonde Collection is divided into 26 series and contains approximately 1,900 items. The majority of the collection consists of correspondence, concert posters and programs, and audio and video recordings. Activities of the Sonde group are described together as Sonde Papers and the activities of Charles de Mestral, a founding member of the group as Charles de Mestral Papers.
In the Sonde Papers, whenever it has been possible to do so, each item is referenced to the events listing, a numbered, chronological listing of events created by the group, entitled: ACTIVITES DU GROUPE SONDE (1975-2010) / Sonde Activities (1975-2010). The Sonde Papers include posters, programmes, scores, photographs, audio and video recordings.
The Charles de Mestral Papers are the personal items of Charles de Mestral, a member of the Sonde group from its inception. Whenever it has been possible to do so, each item is referenced to the events listing entitled: RÉALISATIONS DANS LE DOMAINE DE L’INSTALLATION SONORE (1985-2013, Charles de Mestral) / Sound Installations (1985-2013, Charles de Mestral) a numbered, chronological list of activities of Charles de Mestral. The Charles de Mestral Papers include scores, correspondence, installation plans, clippings, audio recordings and publications.

The Hellmuth Wolff Organ Collection consists primarily of organ plans, pamphlets, photographs, books and periodicals, and personal correspondence. The majority of these documents are associated with or represent one of the fifty organs in Wolff’s opus. In addition to depicting Wolff’s instruments, the collection of organ plans also includes Wolff’s drawings for proposed but not-constructed organs, plans by other organ builders, and plans drawn by Wolff that are based on historical models and treatises by writers such as Dom Bédos. Of the photographs, most are associated with specific Wolff organ projects and represent a span date of the late 1960s to the early 2000s. Also in the photograph collection are images of historical organs in Europe, which Wolff presumably used in modelling and designing several of his instruments, as well as images associated with other organ projects by builders such as Casavant Frères, Karl Wilhelm, and Rieger, all of whom Wolff worked with before establishing his own workshop in Laval. The collection of pamphlets includes programs, program notes, and concert series information for several of the Recitals and concerts performed on Wolff’s instruments. Of the periodicals and books, titles include The American Organist, Choir & Organ, and Orgelforum. Also in the collection are several three-dimensional models, or maquettes, of Wolff organs.

The collection consists of programs and recordings of ensemble performances (including opera) by students, faculty members, and guest artists associated with the Schulich School of Music at McGill University and performed at one of the School's halls (Pollack Hall, Redpath Hall, Tanna Schulich Hall, and Clara Lichtenstein Hall), as well as some performances at venues outside McGill.

The fonds consists of a typed manuscript and a xerox sheet containing information collected by R.C. Amaron about Edwin Hatch, prepared for Dr. R. Williamson of England.

The collection consists of informational files on Juda Hirsch Quastel, collected by T. L. Sourkes and F. C. MacIntosh for a biography of J. H. Quastel for "Memoirs of the Royal Society of London", vol. 36, 1990. The files include material from the Royal Society itself, letters from many people about Quastel, laudatory articles about him along with obituaries about his death, some notes by Hank in his handwriting, and other items.

The McGill Poster Collection documents posters and ephemera announcing campus activities, primarily in the 1970s with some 1980s and 1990s material present.

This collection is composed of McGill memorabilia collected by Ian C. Pilarczyk between 2000 and 2018, and includes articles, news clippings, programs (mostly football), pamphlets, photographs, objects (such as pins, buttons, medals, ribbons, humidors, spoons), addresses, medical notebooks, LPs and prints.

The fonds consists of a scrapbook containing photos, ephemera, and clippings related to the McGill graduates athletic club, Winter Carnival, and copies of the McGill News, approximately 1947. In addition, there is a photograph of Convocation (May 22, 1946), a cardigan sweater and a MOC patch.

This collection is an artificial collection containing archival material related to McGill University. The material in this collection was created over time by McGill administration, staff, faculty, and students, between roughly 1800 and 2019. The subject of the material varies, but the collection generally documents the activities of the university and its staff, and the experiences of McGill students, both during their studies and after graduation.

The collection is arranged by form/genre into 7 series: 01 Documents, 02 Ephemera, 03 Scrapbooks and notebooks, 04 Graphic materials, 05 Audiovisual materials, 06 Textiles, 07 Artifacts. This arrangement was chosen because of the collection’s size, and because it was artificially created by the University’s archives by combining many smaller collections and fonds.

Information about the university bodies, student groups, or people represented in the collection is found in the statement of responsibility and scope and content fields at the file or item level.