RISM: Répertoire International des Sources Musicales (International Inventory of Musical Sources)
"RISM's database offers the most comprehensive documentation available for music manuscripts and printed music for the time between 1600 and 1800."
RIdIM: The Répertoire International d’Iconographie Musicale (International Iconography of Musical Sources)
RIdIM is an international index of visual sources of music, dance, theatre, and opera.
Warning. This portal has many dead links but most major organizations are current.
Indiana University. Musical organizations and professional societies
