| Bartók | Bartók Archivum Budapest |
| Britten | Britten-Pears Library |
| Busoni | Centro Studi Musicali Ferruccio Busoni, Piazza della Vittoria 16, I-50053 Empoli |
| Cage | The John Cage Trust |
| Dallapiccola | Archivio Contemporaneo A. Bonsanti, Via Maggio 42, I-50125 Firenze |
| Debussy | Centre de documentation Claude Debussy, 2 rue Louvois, F-75002 Paris |
| Eisler | Internationale Hanns Eisler Gesellschaft |
| de Falla | Archivo Manuel de Falla |
| Hindemith | Paul Hindemith Institut |
| Janácek | Leos Janácek Foundation |
| Kodály | The Kodály Archives and the Memorial Museum |
| Krenek | Ernst Krenek Institut |
| Mahler | Centre de Documentation Musicale Bibliothèque Gustav Mahler |
| Martinu | Bohuslav Martinu Institute in Prague |
| Milhaud | F.W. Olin Library, Mills College |
| Nielsen | The Carl Nielsen Museum |
| Nono | Archivio Luigi Nono |
| Orff | Orff-Zentrum München |
| Petrassi | Istituto di Studi Musicale Goffredo Petrassi |
| Reger | Max Reger Institut |
| Satie | The Archives of the Erik Satie Foundation, Ornella Volta, 56 rue des Tournelles, F-75003 Paris |
| Scelsi | Fondazione Isabella Scelsi, Via di S. Teodoro 8, I-00186 Roma |
| Schönberg | Arnold Schönberg Center |
| Schreker | Société Franz Schreker, 12 rue de la Pierre Levée, F-75011 Paris |
| Shostakovich | Centre for Enthusiasts of the Music of Dmitri Shostakovich, Olsufjevskij 8, Block 5, Moscow, T+F 09543 30613 |
| Sibelius | Jean Sibelius Works |
| Strauss | Richard Strauss Institut |
| Szymanowski | Karol Szymanowski Museum |
| Vaughan Williams | RVW Limited (at present only e-mail) |
| Walton | William Walton Trust and Fondazione William Walton |
| Weill | Kurt Weill Foundation for Music, Inc and Kurt Weill Gesellschaft Dessau |
| Yun | Internationale Isang Yun Gesellschaft e.V. |
| General: | Getty Research Library |
| Paul Sacher Stiftung, Münsterplatz 4, CH-4051 Basel | |
| Stiftung Archiv der Akademie der Künste, Berlin | |
| British Music Information Centre | |
| Centre de Documentation de la Musique Contemporaine |