Thus you are saying that the only music should be that sung by only the congregation. That there should not be a choir or a soloist?
I realize my reply sounds like I'm singling out congregational over individual, but that was not my intemnt.
I sing in the choir and in the congregation and just LOVE to harmonize.
When we sing choir, I sing my part as written, when in the congregation I just sing to the Lord and I've discovered an occasional "barber shop quartet" type harmony that just makes me smile.