An antiphon ([[Greek]] ἀντίφωνον, ἀντί "opposite" + φωνή "[[voice]]") in Christian music and [[ritual]], is a "'''responsory'''" by a [[choir]] or congregation, usually in Gregorian chant, to a psalm or other [[text]] in a religious service or musical work. | An antiphon ([[Greek]] ἀντίφωνον, ἀντί "opposite" + φωνή "[[voice]]") in Christian music and [[ritual]], is a "'''responsory'''" by a [[choir]] or congregation, usually in Gregorian chant, to a psalm or other [[text]] in a religious service or musical work. |