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How did Pope Gregory I organize chants for the Roman Catholic liturgical calendar?

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Western music The universality and innate nature of music, and the pentatonic scale, as demonstrated by singer Bobby McFerrin.

Pope Gregory I (reigned 590–604) is traditionally credited with the collection and codification of the monophonic liturgical music of the Roman Catholic Church, which is now known as Gregorian chant.12

While the specific mechanics of his organizational process are not detailed in historical records, his influence is closely tied to the schola cantorum, a papal singing school that he is said to have reorganized. This institution played a vital role in standardizing the plainsong repertory by teaching singing techniques and chants through oral tradition, with a course of study reportedly lasting nine years under his direction.3

It is important to note that while the chant bears his name, modern musicological research suggests that the body of music we recognize today as Gregorian chant likely evolved through a process of assimilation between Roman and Gallican traditions during the 8th and 9th centuries, particularly under the influence of the Frankish kingdom and Charlemagne.41