The problem with thinking that all should sing all is that each part of the liturgy shines best when assigned to the appropriate participant. Does eveyone sing the priests part? Of course not. Does everyone chant the reading? No. Well, the same is for the choir. They are not just the 'leading voice' of the congregation. They have a specific role to play as does the cantor. So does the organ. If the people sang all the responses (dialogues with the priest) and all the ordinary parts and perhaps a hymn when it is called for in the Missal, I think you would have a fair balance of music for the people. Of course, on high feast days, the ordinary can be sung by the choir as can the propers and the people could sing even less.Propers are not the enemy of the people. Hymns are not the enemy of the sacred liturgy when chosen carefully and used to foster devotion.
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