So now, if you want to understand the body of Christ, listen to the Apostle Paul speaking to the faithful: "You are the body of Christ, member for member." [1 Cor. 12.27] If you, therefore, are Christ's body and members, it is your own mystery that is placed on the Lord's table! It is your own mystery that you are receiving! You are saying "Amen" to what you are: your response is a personal signature, affirming your faith. When you hear "The body of Christ", you reply "Amen." Be a member of Christ's body, then, so that your "Amen" may ring true!
--Augustine, Sermon 272
Why not? The Church in Her wisdom has traditionally maximized the freedom of its members (and of its musicians) in matters not directly bearing on faith and morals. There's a reason for that: one guy in an office has just as much original sin as the rest of us. Unless that one guy happens to be the Pope, he doesn't automagically have the Magisterium on his shoulders. So he could very easily do more harm than good. Consider it a liturgical iteration of the principle of subsidiarity. We don't want somebody telling composers what to do musically. How do you know such a commission would support what you consider to be proper church music?
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