It started well before that, at least as far back as the great Tra le Sollecitudini.
Congregational singing should be encouraged, but it can't be an excuse to dumb down the liturgy one iota, and it can't interfere with more important things like interior participation.
The first thing the people are supposed to know how to sing is "Et cum spiritu tuo". Precisely how often is this "programmed" at parishes that claim to make congregational singing a priority?
The congregation assembled in one place opens into the whole. It also represents those who are absent and unites itself with those who are far and near. If the congregation has a choir that can draw it into cosmic praise and into the open expanse of heaven and earth more powerfully than its own stammering, then the representative function of the choir is at this moment particularly appropriate. Through the choir a greater transparency to the praise of the angels and therefore a more profound, interior joining in with their singing are bestowed than a congregation’s own acclamation and song would be capable of doing in many places…. Does it not do us good, before we set off into the center of the mystery, to encounter a short time of filled silence in which the choir calms us interiorly, leading each one of us into silent prayer and thus into a union that can occur only on the inside? Must we not relearn this silent, inner co-praying with each other and with the angels and saints, the living and the dead, and with Christ himself? This way the words of the Canon do not become worn-out expressions that we then in vain attempt to substitute with ever newly assembled phrases, phrases which conceal the absence of the real inner event of the liturgy, the departure from human speech into being touched by the eternal.
My experience with ecumenical dialogue has been the Catholics in the room attempting to minimize the Faith and exclaim, "See! We are just like you."
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