The Repertoire International des Sources Musicales (RISM) indexes over 700,000 primary-source music manuscripts, treatises, and libretti, by over 30,000 composers, housed in hundreds of libraries and archives around the world. The online catalogue includes RISM's publication Series A/II (Music Manuscripts after 1600).
Contains 400,000 pages of classical scores from both in-copyright and public domain editions. The major composers output is represented, as well as many lesser known composers and works. Includes works spanning time periods from the Renaissance to the 21st century. Coverage of score types is comprehensive, with full scores, study scores, piano and vocal scores, and piano reductions.