Gregorian Chant In the three centuries following the death of Saint Benedict, there emerged in the Western Church a marvelously unified tradition of liturgical music known as Gregorian Chant, taking its name from the sixth century Pope Saint Gregory the Great, who did much to promote the use of the chant.Characterized chiefly by its purely melodic form, without even the simplest harmonies, Gregorian Chant is sometimes known as "plainsong"; the word "plain" being used to distinguish it from the later harmonic music rather than to denote any lack of charm or interest.Noteworthy also is the unmeasured or "free" rhythm:...