Open access catalog of the Répertoire International des Sources Musicales (International Inventory of Musical Sources), documenting over one million manuscript and print musical sources from the holdings of hundreds of libraries and archives around the world. Contains RISM series A/I (Music Prints before 1800, now expanding into the early nineteenth century), A/II (Music Manuscripts after 1600), and part of B/I (Printed Anthologies Issued 1500-1550). Search by composer, title, thematic catalog number, music incipit, library, and other options. A growing number of catalog entries include links to digitized sources. Also known as the RISM-OPAC and RISM Online. Note: RISM catalogs concerning writings on music theory (medieval to 1800) and specialized music repertories are available in print only.