, it includes substantial portions of the Divine Office, specifically
Before delving into the specifics of the 1952 edition, it is essential to understand what the Liber Usualis actually is. Translated from Latin as the "Book of Common Use," it is a comprehensive collection of Gregorian chant. Compiled by the monks of the Abbey of Solesmes in France, it contains the typical chants necessary for the celebration of the Mass (Ordinary and Proper) and the Divine Office (Canonical Hours) according to the Roman Rite. Liber Usualis 1952 Pdf
For further reading: Dom Eugène Cardine, Gregorian Semiology ; Mary Berry, Plainchant for Everyman ; or the CMAA’s online resources on chant rhythm. , it includes substantial portions of the Divine