Octoechos
Oktōēchos (here transcribed "Octoechos"; Greek: ὁ Ὀκτώηχος [okˈtóixos]; from ὀκτώ "eight" and ἦχος "sound, mode" called echos; Slavonic: Осмогласие, Osmoglasie from о́смь "eight" and гласъ, Glagolitic: ⰳⰾⰰⱄⱏ, "voice, sound") is the name of the eight-mode system used for the composition of religious chant in Byzantine, Syriac, Armenian, Georgian, Latin and Slavic churches since the Middle Ages. In a modified form the octoechos is still regarded as the foundation of the tradition of monodic chant in the Byzantine Rite today.
Nomenclature
The names ascribed to the eight tones differ in translations into Church Slavonic. The Slavonic system counted the plagioi echoi as Glas 5, 6, 7, and 8. For reference, these differences are shown here together with the Ancient Greek names of the octave species according to the Hagiopolites and to the chant treatises and tonaries of Carolingian theorists. Fifteenth-century composers like Manuel Chrysaphes, Lampadarios at the Court of Palaiologan Constantinople exchanged the Phrygian with the Lydian. The Armenian names and their temporal cycles are represented in the article about the hymn books octoechos and parakletike.
Octoechos (liturgy)
The liturgical book called Octoechos (from the Greek: ἡ Ὀκτώηχος [okˈtoixos]; from ὀκτώ "eight" and ἦχος "sound, mode" called echos; Slavonic: Осмѡгласникъ, Osmoglasnik from о́смь "eight" and гласъ "voice, sound") contains a repertoire of hymns ordered in eight parts according to the eight echoi (tones or modes). Originally created as a hymn book with musical notation in the Stoudios monastery during the 9th century, it is used until nowadays in many rites of Eastern Christianity. The hymn book has something in common with the book tonary of the Western Church. Both contained the melodic models of the octoechos system, but the tonary served simply for a modal classification, while the book octoechos is as well organized as a certain temporal of several eight week periods and the word itself means the repertoire of hymns sung during the celebrations of the Sunday Office.
Performing an avtomelon over a kontakion by Romanos
Kathismata, odes or kontakia are set in a strict meter—a rhythm within a fixed number of verses as a strophe, a fixed number of syllables and accents as a verse. Despite the meter it is possible to arrange a complex poem like the prooimion of a Christmas kontakion composed by Romanos the Melodist which has its own history as a kontakion with its music and text, according to the simple melodic model of a sticheron in echos tritos of the Octoechos. In the current tradition the kontakion exists as well as avtomelon—as a model to recite stichera prosomoia which was as well translated into Old Church Slavonic.
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