Hello , this is my first time to ask ??..

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This may not be the right place, but here it goes.
Three Churches in CO, do not sing the Sunday Psalm for the day. The choir sings a different one every time. Our Holy Mother Church guides us to combine all the Liturgy to guide us in the readings and Gospel for that day. I asked two priests & they both said it is too hard or it is easier for the choir to sing others. That is not a acceptable answer since other complicated Psalms are sung,. I responded " does the Church allow this ?" they both responded “yes, it is ok”. I do not feel comfortable wth that answer. Please let me know . If it is not allowed, how would I approach the two priests of two different parishes to let them know the Truth ?
I hope I do not have to go thru this Thread; because I do not know how to use it and I have limited time at library, & gets vry frustrating. God’s peace & joy lupe Hernandez