"An antiphon (Greek ἀντίφωνον, ἀντί "opposite" and φωνή "voice") is a short chant in Christian ritual, sung as a refrain. The texts of antiphons are the Psalms. Their form was favored by St Ambrose and they feature prominently in Ambrosian chant, but they are used widely in Gregorian chant as well. They may be used during Mass, for the Introit, the Offertory or the Communion. They may also be used in the Liturgy of the Hours, typically for Lauds or Vespers.
They should not be confused with Marian antiphons or processional antiphons.
When a chant consists of alternating verses (usually sung by a cantor) and responds (usually sung by the congregation), a refrain is needed. " - (en.wikipedia.org 26.12.2020)
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