This series includes large-scale drawings, preliminary sketches, and general plans of various parts of the organ, such as the buffet, console, keyboards, and windchest. This series is divided into three subseries: organs with opus number; organs without opus number, which includes Wolff’s plans for proposed but ultimately not-constructed organs; and finally plans by other organ builders or Wolff’s drawings based on historical treatises and documents.

This series contains Hellmuth Wolff’s correspondence files. Subseries i contains correspondence between Wolff and various organ builders in English, French and German, primarily related to Wolff’s editorial work for the for the International Society of Organbuilders’ ISO Yearbook 1993, which spanned four years from 1992-1996. Subseries ii contains workshop documents, including opus lists.

This series contains the print copies of journals and conference proceedings in Hellmuth Wolff’s library. There are some annotations on several of the issues. The works are listed in two separate bibliographies in Appendix 1: Periodicals/Journals Bibliography and Appendix 2: Conference Publications Bibliography.

This series contains print copies of published monographs of various languages. The works are lists in the bibliography in Appendix 3: Book Collection Bibliography.

This series contains seven recordings of organ music on Wolff organs.
Beauséjour, Luc (organist). Sonates bibliques = Biblical sonatas. Johann Kuhnau. CBC Records = Disques SRC MVCD 1086, 1996, compact disc.
Choir of the Church of St. John the Evangelist and Patrick Wedd (organist). A liturgical year: Alleluia psallat. Various composers. Church of St. John the Evangelist SJE CD0001, 1996, compact disc.
Fitzau, Jörn (organ builder). Organpipes. J. F. Organpipes, Promotional DVD from Taylor Fladgate.
Grew, John (organist). Livre d'orgue. Nicolas de Grigny. Outremont, Quebec: ATMA ACD 2 2169, 1998, compact disc.
MacDonald, David (organist). Journeys: Organ of Atlantic School of Theology. Various composers. CBC Radio Maritimes, 1997, compact disc.
Musique et tempérament [accord de l'orgue et du clavecin selon les tempéraments anciens]. Pierre-Yves Asselin, organ and Yannick Legaillard, harpsichord. Éditions Costallat MCE 9267-2, 1985, 2 cassettes.
Rousseau, Régis (organist). Johann Pachelbel. Johann Pachelbel. ATMA ACD 2 2173, 1998, compact disc.

This series contains published annual calendars from three European organ builders.

This series contains a variety of photographs, correspondence and scrapbook items related to Donald Mackey and the Renaissance Singers. Notes on several items suggest that the owner of this material was Helen Mackey. Please see the Donald Mackey Collection and accompanying finding aid at http://www.mcgill.ca/library/find/subjects/music/special/donald-mackey-collection for related material.

The documents in this series include posters for concerts, several of which were given on Wolff’s instruments, as well as drawings and sketches of Wolff organs. These documents are not rolled like the organ plans in Series 1 but rather are spread flat

The Pamphlets series includes programs, program notes, and general publicity for several of the organs in Wolff’s opus. These are stored in folders and divided into three subseries: documents associated with Wolff organs, publicity for Wolff & Associés, and pamphlets for non-Wolff instruments.

The photographs in this series cover the several stages of the organ-building process. This series includes both colour and black-and-white images of the construction of a given organ at Wolff’s atelier, the installation of the organ, as well as concerts, dedications, and social events at or around the time of the organ’s installation.