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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.

Medieval music refers to the diverse sacred and secular musical practices of Europe between the fall of the Western Roman Empire and the dawn of the Renaissance. It spans more than eight centuries, from early monophonic chant to the first notated polyphony. Core features include the use of church modes rather than major/minor, extensive reliance on vocal music (Latin sacred chant as well as vernacular song), and the progressive development from unmeasured chant to rhythmic modal notation and, later, mensural notation. Texture evolves from monophony (plainchant, troubadour songs) to organum, conductus, and the motet, culminating in complex isorhythmic works by the late 13th–14th centuries. Secular traditions—troubadours and trouvères in France, Minnesänger in German lands, and the Iberian Cantigas—coexisted with and influenced sacred practice. Instruments such as the vielle, harp, psaltery, recorder, shawm, hurdy-gurdy, and portative organ often doubled or accompanied voices, though much music remained purely vocal.

Byzantine chant is the monophonic, a cappella liturgical music of the Eastern Roman (Byzantine) Church, sung primarily in Greek and organized around the octoechos (eight-mode) system. Its melodies are modal rather than harmonic, unfolding in one line supported in later practice by a sustained drone (ison). The repertory sets biblical psalms and hymnic poetry (e.g., troparia, kontakia, stichera, and canons) to melodies that follow textual accent and rhetorical pacing rather than strict meter. Notation employs neumes that encode melodic direction and ornate formulae, preserving a highly codified oral tradition. The sound is characterized by free rhythm, microtonal inflections in certain modes, and an austere, prayerful timbre designed for resonant ecclesiastical spaces. Byzantine chant remains central to the worship of the Eastern Orthodox Church and has shaped a wide family of chant traditions across the Mediterranean and Slavic worlds.

Byzantine music is the sacred chant tradition of the Byzantine (Eastern Roman) Empire, cultivated primarily in the Greek-speaking Christian world. It is a monophonic, vocal art that uses modal systems (the Octoechos), formulaic melodic patterns, and an ison (drone) to support the principal melody. It is performed a cappella in liturgical contexts, with texts drawn from scripture and hymnography in Greek and related Christian languages. Its notation developed a distinctive neumatic script, and its aesthetics emphasize prayerful sobriety, rhetorical declamation of sacred texts, and highly ornamented melodic gestures governed by modal grammar.

Hymns are strophic, text-driven songs of praise, devotion, or instruction intended for congregational or communal singing, most closely associated with Christian worship. They typically use clear, memorable melodies, regular poetic meters, and straightforward harmonies so that large groups can sing together with ease. While the concept of a hymn as a sacred song predates Christianity (e.g., in Ancient Greek and Jewish traditions), Christian hymnody coalesced late in the 4th century with Ambrosian practice in Milan and then expanded through Latin and Greek liturgical cultures. Over time, hymn singing moved from monastic and cathedral settings into congregational life, especially after the Protestant Reformation, where metrical psalms and vernacular hymns became a defining feature of worship. Modern hymnody ranges from chant-like, modal melodies without accompaniment to robust, four-part chorale harmonizations with organ, and even contemporary arrangements that adapt classic hymn texts and tunes to newer popular styles.