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'''Gregorian chant''' (, or less commonly known as '''Carolingian chant''') is the central tradition of Western [[plainsong|plainchant]], a form of [[monophony|monophonic]] [[liturgy|liturgical]] music within [[Western Rite|Western Orthodoxy]] that accompanied the celebration of Mass and other ritual services. It is named after [[Gregory the Dialogist|Pope Gregory I]], Bishop of Rome from 590 to 604.