International Inventory of Musical Sources
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The International Inventory of Musical Sources (abbreviated as RISM — Répertoire International des Sources Musicales) was founded in Paris in 1952. This international non-profit joint venture aims to comprehensively document extant musical sources around the world. It is the largest and only global operation registering and documenting written musical sources.
The musical sources under its purview included manuscripts, printed music, works on music theory and libretti. These are stored in libraries, archives, monasteries, schools and private collections the world over.