Gregorian Chant

"Gregorian chant is the central tradition of Western plainchant, a form of monophonic, unaccompanied sacred song of the Catholic Church. Gregorian chant developed mainly in the Frankish lands of western and central Europe during the ninth and tenth centuries, with later additions and redactions. Although popular legend credits Pope St. Gregory the Great with inventing Gregorian chant, scholars believe that it arose from a later Carolingian synthesis of Roman chant and Gallican chant.

Gregorian chants are organized into eight scalar modes. Typical melodic features include characteristic incipits and cadences, the use of reciting tones around which the other notes of the melody revolve, and a vocabulary of musical motifs woven together through a process called centonization to create families of related chants. Instead of octave scales, six-note patterns called hexachords underlie the modes. These patterns use elements of the modern diatonic scale as well as what would now be called B-flat. Gregorian melodies are transcribed using neumes, an early form of musical notation from which the modern five-line staff developed during the sixteenth century.[1] Gregorian chant played a fundamental role in the development of polyphony.

Gregorian chant was traditionally sung by choirs of men and boys in churches, or by women and men of religious orders in their chapels. It is the music of the Roman Rite, performed in the Mass and the monastic Office. Gregorian chant supplanted or marginalized the other indigenous plainchant traditions of the Christian West to become the official music of the Catholic liturgy. Although Gregorian chant is no longer obligatory, the Catholic Church still officially considers it the music most suitable for worship.[2] During the twentieth century, Gregorian chant underwent a musicological and popular resurgence." --- Source: Wikipedia