RISM OnlineRISM Online (Répertoire International des Sources Musicales), a service from the RISM Digital Center, is a database that provides access to music manuscripts, printed music editions, writings on music theory, and libretti that are found in libraries, archives, churches, schools, and private collections worldwide. Multiple entry points, with extensive Source, Person, and Institution search interfaces, provide users with the ability to quickly narrow down relevant results using several different approaches, including keyword searches, filters, and relationship information.