The Concerts & Competitions Series contains programs, correspondence and reviews for performances of Schloss’s compositions. Items are arranged by date of event.

The Clippings Series contains articles and clippings from newspapers, magazines and journals that pertain to people, music, and specific periods of Schloss’s life. Items are arranged topically.

The Miscellaneous Series contains a collection of items that distinguish themselves from the other series. These include copies of literary works, documents, stamps, advertisements, and the artifacts of Bergiana pertaining to the Lyric Suite. Items are arranged topically.

The Photographs Series contains autographed photographs of Alban Berg, Fritz Heinrich Klein, and Bernhard Sekles, as well as photographs of Julius Schloss. Additional photographs printed in other series of the collection are listed below as well.

The Biographical Information series contains correspondence, programmes and a photograph of Kelsey Jones. The series consists of cards and letters to or from Kelsey Jones; as well as a selected of programs he found interesting. The series is arranged chronologically, and are divided by subject headings (the subject headings chosen for this section were indicated by Kelsey Jones himself). The series includes correspondence of special note to/from Lord Beaverbrook, John Beckwith, Marvin Duchow, Herman Geiger-Torel, Harold Hamer, Leonard Isaacs, George Johnston, George Little, Ernest MacMillan and Healy Willan.

The Compositions series contains sketches, texts and manuscripts of 30 of Kelsey Jones’ major compositions. The works are arranged chronologically. Composition dates, durations and instrumentations are provided when possible.

The Montreal Mendelssohn Choir donated eight volumes of choral sheet music from the Choir’s library in 1895, a year after the Choir’s dissolution. There are only seven extant volumes in the collection because volume 6 has been missing since at least the 1980s.

Three volumes of choral sheet music from the Choir’s library were donated to McGill University by the Estate of D. Torrance Fraser, a former choir member, in 1926. The pieces in these three volumes are second copies of those pieces found in Series 1. In 1927, another volume of sheet music from the Choir’s library was donated to McGill University by the Estate of D. Torrance Fraser. This fourth volume (DTF2) contains many pieces not found in the other volumes.

The Compositions series contains compositional documentation, 48 original compositions, 14 arrangements, and numerous untitled sketches. The compositions are organized alphabetically by uniform title, with a separate subsection entitled the “Bach Gamba Project”. Composition dates, durations and instrumentations are provided when possible.

The Audio/Visual Materials series contains 97 slides, records, audiotape reels, and digital audiotapes (cassette) and CD.