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.

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

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

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 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 various guides, rules and objects presumably used in the Wolff & Associés workshop.

This series contains various temperament specifications.

This series contains French language reports prepared by the Ministère des Affaires culturelles du Québec, Direction régionale de Montréal, Direction du Patrimoine, by various authors. Each report is typescript and contains black and white photographs.

The maquettes in this series are various sizes of three-dimensional models of organs.