This morphing has been going on a long time, e.g. The Marian Antiphons. And -Definition of antiphon
1 : a psalm, anthem, or verse sung responsively
2 : a verse usually from Scripture said or sung before and after a canticle, psalm, or psalm verse as part of the liturgy
The Roman Missal even (mis)uses the word to identify the alternative spoken texts for entrance and communion, which are versicles unsupported by any response!Origin and Etymology of anthem
Middle English antem, from Old English antefn, from Late Latin antiphona, from Late Greek antiphōna, plural of antiphōnon, from Greek, neuter of antiphōnos responsive, from anti- + phōnē sound —
the recurring response in Responsorial Psalmody isn't and is not ever correctly called an 'antiphon'
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