Database for Latin ecclesiastical chant: the most extensive and authoritative source for chant manuscripts
Includes inventories of both Office and Mass chants, transcriptions of chant melodies (with and without text), and links to images of many manuscripts
Provides information on the feast, the Office, where in the Office, the mode (and differentia, if relevant), and lists manuscripts in which the chant can be found
Open-access pdfs of various Gregorian chant resources
All pdfs are downloadable and most come from the Church Music Association of America
Bryden, John R. and David G. Hughes, eds. An Index of Gregorian Chant. 2 vols. Cambridge, MA: Harvard University Press, 1969.ML102 C45 B8 (Bryden and Hughes)
Index of Gregorian chant texts and melodies mostly from modern chant books
Omitted: Ambrosian chant and “old-roman” repertory
Omitted: Sequences, tropes, proses, versus and conductus, prosulae
Textual (vol. 1) or melodic (vol. 2) incipits, indicating where the chant can be found in modern chant books