The collection is composed of a variety of typescript and manuscript material. This includes:
- Lectures on the history of music
- Lectures in counterpoint and harmony
- Contrapuntal compositions for analysis
- Compositions, loose sheet music
- Note-books
- Notes on history and form
- Lectures on accompaniment, modulation and tonality
- Minute book of the Faculty of Music, 1894-
- Address by Niecks, 31 January 1900, to a meeting of Edinburgh music teachers
- Introductory lecture, 14 October 1901: A music school for Scotland
- Talk: The place of music in education
- Talk: General culture and musicians
- Laureation address: For Hon.Degrees of Doctor of Music 1910
- Testimonials and additional testimonials in favour of Niecks, candidacy for the Chair of Music, 1891
- Extracts from the Proceedings of the Musical Association, 16th Session, 1889-1890
- Extracts from the Proceedings of the Musical Association, 26th Session, 1899-1900