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The WorldCat database is the key to the universe of published material in all formats owned by libraries worldwide. If you can't find a score or book anywhere else, WorldCat is sure to have a copy to locate to borrow on interlibrary loan or request a scan.
ViFaMusik is a European musicology information service sponsored by Bavarian State Library, State Institute for Musicological Research, German Musicological Society. This central portal for music and musicology allows you to access an extensive digital library containing early digitized scores, the latest scholarly research and online resources and bibliographical data about these resources.