Gregorian Chant
The monophonic liturgical chant of the medieval Western church: its modes, notation, and the traditions that preserved it.
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Gregorian chant is the monophonic, unaccompanied liturgical song of the medieval Western (Latin) church. It is sung in Latin, in free rhythm, by a soloist, a choir, or the congregation, and its texts are drawn overwhelmingly from the Psalms and other scriptural sources, fitted to the liturgical calendar. It is named after Pope Gregory I (reigned 590–604), to whom legend attributes its compilation — a dove was said to have dictated the melodies to him. Modern scholarship treats this attribution as conventional rather than historical: the repertoire as it survives was assembled over the eighth and ninth centuries, probably through a synthesis of Roman and Frankish practice under the Carolingian emperors, and was transmitted orally before it was written down.
The melodies are organized by the eight church modes, each defined by a final (the note on which melodies end) and an ambitus (the range of the melody): the four authentic modes on D, E, F, and G, and their four plagal derivatives, which lie a fourth lower. Despite their Greek names (Dorian, Phrygian, and so on), the medieval modes have only a loose connection to ancient Greek theory. The modal system gives chant its characteristic sound — scales built on D, E, F, or G with particular half-step placements, quite different from the major–minor system that later dominated Western music.
Chant notation began with neumes, the small signs written above the text in the earliest surviving manuscripts of the ninth and tenth centuries, which indicated melodic contours rather than exact pitches. The development of the staff in the eleventh century — credited to Guido of Arezzo, who also introduced the solmization syllables ut, re, mi, fa, sol, la — made pitch exact and is a pivotal moment in the history of Western notation. Chant is written today in square notation on a four-line staff.
Performance practice is text-driven: rhythm follows the natural accents and phrasing of the Latin text rather than fixed note values, instruments are excluded, and voices alternate between soloist and choir (responsorial) or between two halves of the choir (antiphonal). The rhythmic interpretation of chant remains debated among scholars, with some favoring equal note values and others a freer, speech-like rhythm.
The later history is a series of transformations. From the twelfth century, composers built polyphony on chant melodies: the earliest organum added a second voice to a chant, and the Notre Dame school of Léonin and Pérotin turned this into measured polyphony — making chant the foundation of the Western art-music tradition. The Council of Trent (mid-sixteenth century) sought to purify the repertoire; the Benedictine abbey of Solesmes led a nineteenth-century restoration of what it considered the authentic melodies, producing the official Vatican editions; and chant remains in use in Catholic liturgy and beyond, still a living repertoire rather than a museum piece.
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liturgy medieval music music history