RISM stands for Répertoire international des sources musicales, an ongoing project to document musical sources in libraries all over the world. Its purpose is to let researchers discover where particular sources are held and to see which sources a particular institution holds.
RISM is divided into three series. Series A lists printed and manuscript music from 1600-1800, arranged by composer. Series B documents materials dealing with specific topics. Series C is a directory of music research libraries.
All of the libraries in RISM are identified by sigla, which generally give an indication of where the library is located. The siglum for the Library of Congress, for example, is US-Wc: US=United States, W=Washington, D.C., and c=Library of Congress. The RISM Sigla Catalogue is available online.
The RISM series is availabe in the Reference section of the music library under the following call numbers.
Location: Allen Music Library Reference ML113 .I6