In the absence of a perfectly preserved oral tradition, or of any audio recordings from the early stages in the development of the Gregorian repertoire, any discussion of performance practice necessarily concerns the issue of print editions. One of the main distinctions (but by no means the only one) between various editions currently in use is the type of notation employed. Terms such as “neumatic” and “quadratic” (or simply “square notes”) are often applied indiscriminately to various types of notation, a problem that is compounded by the equally imprecise use of the term “modern notation.”

Read more in Chant editions.