Associations

American Composers Forum
American Music Center
American Musical Instrument Society
American Musicological Society
Association for Recorded Sound Collections
International Association for the Study of Popular Music
International Association of Music Libraries, Archives, and Documentation Centres
Music Library Association
Music Publishers' Association
Recording Industry Association of America
Society for American Music
Society for Ethnomusicology
Society for Music Theory
Society for Seventeenth-Century Music

Music libraries & research centers

USA:
Library of Congress (LC): Performing Arts Reading Room
LC: Recorded Sound Reference Center
New York Public Library for the Performing Arts
American Music Center
Cultural Policy & the Arts National Data Archive
Music Cognition Resource Center
Music Libraries in the US & Canada

California/Bay Area:
UC Berkeley Music Library
Melvyl (UC Union Catalog)
San Francisco Public Library
Museum of Performance and Design (formerly SFPALM)
Ira F. Brilliant Center for Beethoven Studies

International:
British Library Music Collections
Turning the Pages (British Library)
Staatsbibliothek zu Berlin Musikabteilung
Bibliothèque nationale de France Departement de la Musique
IRCAM
The European Library (consortium catalog of national libraries)

Bay Area performance

American Bach Soloists
Ballet San Jose
Berkeley Symphony Orchestra
California Bach Society
Carmel Bach Festival
Chanticleer
Golden Gate Men's Chorus
Ives Quartet
Kronos Quartet
Monterey Jazz Festival
New Century Chamber Orchestra
Other Minds
Paramount Theatre
Philharmonia Baroque Orchestra
St. Lawrence String Quartet
San Francisco Ballet
San Francisco Conservatory of Music
San Francisco Early Music Society
San Francisco Opera and the Performance Archive
San Francisco Symphony
Silicon Valley Symphony
Smuin Ballet
Symphony Silicon Valley
West Bay Opera