Les Petits Chanteurs de Chaillot

Villancico is an Iberian song form that emerged in late medieval Spain and flourished during the Renaissance and Baroque eras. Originally a secular, vernacular song associated with rural or popular themes, it evolved into a predominantly sacred genre performed in churches and cathedrals—especially around Christmas. Structurally, a villancico typically alternates a recurring refrain (estribillo) with one or more stanzas (coplas), often in lively, dance-like meters. Texts may be in Spanish or Portuguese and sometimes incorporate dialects and topical characters (for example, negrillos, pastorcillos), while the music ranges from simple strophic tunes to richly scored polychoral works with instrumental accompaniment.

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.