Kiev Theological Academy Choir

Kyivan chant (Kievan chant) is an Eastern Orthodox liturgical chant tradition associated with Kyiv and widely used across the Ukrainian Orthodox Church, the Russian Orthodox Church, and churches stemming from the Moscow Patriarchate (including the Orthodox Church in America). It grew out of the medieval Slavic chant heritage but, compared to Znamenny chant, it features more syllabic, stepwise, and melodically simplified formulas designed for congregational and parish use. Melodies are organized in the eight-mode (Octoechos) system, rendered primarily in Church Slavonic, and were historically transmitted in distinctive Kyivan square notation. In modern practice, chant lines are often sung in unison or in later four‑part harmonizations while preserving the core modal formulas.

Gregorian chant is the central Western tradition of plainchant: a monophonic, unaccompanied sacred song in Latin (and occasionally Greek) used in the Roman Catholic liturgy. It employs free rhythm guided by the prosody of the text rather than by strict meter, and is sung in unison by clerics or scholas. Its melodies are organized by the system of eight church modes, with characteristic finalis (final), tenor/reciting tones, and melodic formulas. Repertoires include the Proper and Ordinary of the Mass (e.g., Introit, Gradual, Alleluia, Offertory, Communion, Kyrie, Gloria, Credo, Sanctus, Agnus Dei) and the Divine Office (e.g., Antiphons, Responsories, Hymns, Psalms). Although legend credits Pope Gregory I, modern scholarship sees Gregorian chant as a Carolingian synthesis of Old Roman and Gallican chants, standardized across Frankish realms and later the broader Latin West.