A person who advocates for or is devoted to the principles of Gregorian chant or the Gregorian calendar system.
From 'Gregorian,' derived from Pope Gregory XIII (for the calendar) or the tradition of St. Gregory the Great (for the chant), plus the suffix '-ist' indicating a practitioner or believer.
Gregorianists represent a beautiful historical collision: some fought for calendar reform in the 1500s while others preserved ancient music—two very different causes united by one papal name across centuries.
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