- Abbaye Saint-Pierre de Solesmes
- American Musicological Society
- Centro Internazionale di Ricerca sui Periodici Musicali (RIPM)
- Early Music Online (The British Library - Royal Holloway University of London)
- Edinburgh University Collection of Historic Musical Instrument
- Hofmeister XIX
- IAML Italia
- ITMI (Indici della Trattatistica Musicale Italiana)
- Mary Kay Duggan, Italian Music Incunabula
- Monumenta Musicae Byzantinae (University of Copenhagen)
- MUSREF
- Music Library Association (MLA) Clearinghouse
- Archivio storico Ricordi
- The Düben Collection Database Catalogue
- Ufficio Ricerca Fondi Musicali
- University of Virginia Music Library
- Vatican exibition: the music Hall