151. After the consecration when the priest has said, Mysterium fidei (Let us proclaim the mystery of faith), the people sing or say an acclamation using one of the prescribed formulas.
A polyphonic Mysterium makes no sense.
I only use the "A" setting, because our priests believe it is a more accurate translation.
For me the fact that there is a choice of responses to a single prompt is contrary to the principles of liturgical structure, neither missal nor GIRM give any clue as to how the congregation should be guided in their individual choice. The continuance of this absurdity is the most depressing feature of reform.
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