Requiem: Officium defunctorum, 1605

A requiem is a musical setting of the Roman Catholic Mass for the Dead (Missa pro defunctis). Historically rooted in Latin liturgy, it sets movements such as the Introit, Kyrie, (historically) the Sequence Dies irae, Offertory, Sanctus, Agnus Dei, and Communion, and often includes additional responsories like Libera me and In paradisum. While the earliest requiems were monophonic chants, the genre became a showcase for polyphonic and later symphonic choral writing. Renaissance composers wrote austere, modal settings; Classical and Romantic composers expanded the forces and dramatic scope; and 20th–21st century composers reimagined the form with new languages, from neo-modal and impressionistic harmonies to avant‑garde sonorities. Today, requiems appear both in liturgy and as concert works, symbolizing collective mourning, remembrance, and spiritual reflection.

Renaissance music (c. 1400–1600) marks the shift from medieval sonorities to a clearer, triad-based polyphony in which multiple independent voices are treated with near-equal importance. It favors modal counterpoint, pervasive imitation, smooth voice-leading, and carefully prepared cadences. Text intelligibility and expressive text-setting become central concerns, especially in sacred motets and masses and in secular forms like the Italian madrigal and the French chanson. While much of the repertory is a cappella, instrumental consorts (viol, recorder, sackbut, cornett, organ) play a growing role. A steady tactus underpins rhythms, and tuning systems such as meantone temperament shape its characteristic color. Music printing (from 1501) accelerates stylistic diffusion across Europe.

Mass is a large-scale vocal genre that sets the Ordinary of the Roman Catholic liturgy—Kyrie, Gloria, Credo, Sanctus (and Benedictus), and Agnus Dei—most often in Latin. It began as monophonic chant but developed into sophisticated polyphony and later into concert works for choir, soloists, and instruments or full orchestra. Across history, composers have used techniques such as cantus firmus, imitation, paraphrase, and parody to unify movements. The genre spans from austere a cappella writing to monumental symphonic-choral statements, and today is performed both liturgically and in the concert hall. Common subtypes include Missa brevis (short Mass, often omitting the Credo or compact in scale) and Missa solemnis (festal, expansive forces and duration).

Polyphonic chant is a sacred vocal tradition in which two or more independent voices sing liturgical material at the same time, creating vertical harmony from originally monophonic chant. Emerging from the practice of adding a second voice to chant (organum), it favors perfect consonances (fourths, fifths, and octaves) and often places a sustained chant line (tenor) beneath more florid upper parts. In its classic medieval Western form, it is unaccompanied (a cappella), modal rather than tonal, and frequently governed by rhythmic modes. While the Notre Dame school in Paris codified much of its technique, related polyphonic chant practices also exist in other liturgical cultures (e.g., Georgian and Corsican traditions), each with distinctive sonorities and voice-leading norms.