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.
- Dresden, Sächsische Landesbibliothek - Staats-, und Universitätsbibliothek (D-Dl)
- Einsiedeln, Benedikterkloster, Musikbibliothek (CH-E)
- Escorca, Palma de Mallorca - Santuari de Santa Maria de Lluc, Arxiu (E-ESCsl)
- Evanston (IL), Northwestern University, Library (US-Eu)
- Fano, Biblioteca Comunale Federiciana (I-FAN)
- Firenze, Biblioteca Medicea Laurenziana (I-Fl)
- Firenze, Biblioteca del Conservatorio Statale di Musica "Luigi Cherubini" (I-Fc)
- Firenze, Biblioteca Berenson - Morrill Musica Library (I-Fb)
- Firenze, Biblioteca Riccardiana (I-Fr)
- Gaeta, Museo diocesano (I-GAEm)
- Genève, Bibliothèque de Genève (CH-Gpu)
- Genova, Biblioteca del Conservatorio Statale di Musica "N. Paganini" (I-Gl)
- Grottaferrata, Biblioteca Statale del Monumento Nazionale di Grottaferrata (I-GR)
- Hamburg, Staats und Universitätsbibliothek Carl von Ossietzky, Musiksammlung (D-Hs)
- Hannover, Stadtbibliothek, Musikbibliothek (D-HVs)
- Jesi, Biblioteca Comunale (I-IE)
- Lecce, Biblioteca privata Giuseppe Pastore (I-LEpastore)
- London, Royal College of Music (GB-Lcm)
- London, Royal Academy of Music, Library (GB-Lam)
- London, British Library (GB-Lbl)