RISM's catalog is a finding aid for music manuscripts and prints; the online catalog includes Series A/1 and A/II (Music Manuscripts after 1600) and parts of B/1 as well as a list of library sigla. Other components can be found in print in the Orwig Music Library.
"The Music Division is one of the world's preeminent music collections--documenting the art of music in all its diversity - classical and opera as well as the whole spectrum of popular music including spirituals, ragtime, jazz, musical theater, film, rock and world music. While the division contains many scores and manuscripts from centuries past, its curatorial mandate is an activist one, placing major emphasis on capturing the creative output of contemporary composers."
Since its founding in 1998, "the purpose of the Digital Image Archive of Medieval Music (DIAMM) [has been] to obtain and archive digital images of European sources of medieval polyphonic music, captured directly from the original document."
The RId'IM database contains descriptions of visual objects that depict music-making, musical instruments, and similar related objects. Where possible, there are links to online images of the artwork.
A database featuring the 400 musical instruments from around the world held at the University of Washington.
A database of information about musical instruments held in public collections; contains more than 76,000 records.