The index gathers the institutions holding the recorded sources, identified by their RISM siglum where available. Each library points to the catalogue's sources of which it holds at least one copy.
- Bari, Biblioteca nazionale "Sagarriga Visconti-Volpi" (I-BAn)
- Bergamo, Biblioteca Civica "Angelo Mai" (I-BGc)
- Berlin, Staatsbibliothek zu Berlin Preussischer Kulturbesitz (D-Bsb)
- Bologna, Convento di S. Francesco (I-Bsf)
- Bologna, Museo internazionale e Biblioteca della musica (I-Bc)
- Bologna, Archivio-Biblioteca dell'Accademia Filarmonica (I-Baf)
- Brescia, Biblioteca del Conservatorio Statale di Musica "L. Marenzio" (I-BRc)
- Bruxelles, Conservatoire Royal, Bibliothèque (B-Bc)