Digital Image Archive of Medieval Music (DIAMM)
DIAMM is a portal to collections of medieval polyphonic music manuscripts dating ca. 800-1550; it includes information on all the known sources of European polyphonic music, and color images of some of the manuscripts. The database holds information on the entirety of the RISM B/IV Series (Manuscripts of Polyphonic Music, 11-16th centuries), and the Census-Catalogue of Manuscript Sources of Polyphonic Music 1400-1550. Requires free registration to view full-size images. Other projects hosted on DIAMM include the Du Fay Opera Omnia (edited by Alejandro Planchart, in progress), Robert Mitchell's Trent Codices editions, an updated version of the Curtis-Wathey Handlist of Fifteenth-Century Liturgical Music, Helen Deeming's Sources of British Song, c.1150-1300, assorted addenda and corrections to published works, and doctoral dissertations in medieval musicology. Maintained by the University of Oxford.