Or here’s a challenge- find a document that strictly prohibits it!
Good point. The Roman documents often aren’t as cut-and-dried as some people would like to think. “You must sing the text as it is given, without adding anything,” the documents say. But if this were to be understood literally, then it would ban a huge proportion of sacred polyphony from the Mass, since composers so often repeat and interweave the “official” texts. So clearly that is not the intent. The question, then, is whether the use of a refrain is more like other reptitions and embellishments, and thus licit, or more like making things up and sticking in foreign texts, and thus illicit. It is a matter of interpretation, and it can hardly be said that there is one “obvious” answer. The Roman documents do not deal with the question. Consequently, it falls to others to decide on the right course, and that’s what the bishops did on this topic in
Sing to the Lord, which was approved by 88% of the American bishops.
I am sure somebody out there is racing to her keyboard right now to point out that
Sing to the Lord was never submitted to the Holy See for
recognitio, and thus it cannot trump documents like
Sacrosanctum Concilium or even
Liturgiam Authenticam, with their cautions about not changing the Mass texts. That’s the point, though: what’s called for is an interpretation
of those documents, and in the absence of Roman authority to the contrary, the American bishops, through the NCCB/USCCB, are best qualified to carry it out.