Information on differentia
In the original Cantus index for this manuscript, differentiae were identified with a two-digit system: the letter indicated the last note of each differentia and a number distinguished between differentiae of the same mode that ended on the same last note. Variations in repeated notes, neumation, and liquescents were indicated by a lower-case letter suffix.
Klugseder, Robert. Inventory of København (Copenhagen), Det kongelige Bibliotek Slotsholmen, Gl. Kgl. S. 3449, 8o XII. Edited by Andrew Mitchell and Debra Lacoste. In: Cantus Manuscript Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-).
Images: Augsburg Dom, Cantus Planus, Universität Regensburg