H.T. HENRY
The expert in Congregational Singing chosen to write the entry "Singing, Congregational" for the Catholic Encyclopedia is more credible than Buckley.
All the citations within the entry prove it so.
Gregorian chant and choral singing are not in any way the same thing as browbeating parishoners to refrain from contemplation and croak along with puerile and musically retarded ditties.
And every citation you've produced has been by somebody bemoaning the *lack* of singing and calling for "reform."
Looks to me like Buckley is well supported.