It’s not explicitly a communion prayer but it could be considered as such, so I’d go 50-50 on whether it’s appropriate there. What is less appropriate is an explicitly Eucharistic text including a communion antiphon from the psalms or the gospel in motet form (Gustate et videte and the like).
Not really. It’s located in the section of “prayers for after communion” in all the hand missals I own. I’ve never seen it in the “prayers before communion” section. It’s most appropriate to sing it during communion after everyone has received.
Some people think any hymn can be done anywhere… some people think any of the 18 masses in the Kyriale can be done anywhere and even mixed and matched. Others are very particular.
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