Fr. Thomas Kocik quotes, on another blog, Martin Mosebach's The Heresy of Formlessness, pg. 40:
The liturgy has no gaps; it is one single great canticle; where it prescribes silence or the whisper, that is, where the mystery is covered with an acoustic veil, as it were, any hymn would be out of the question.
Mosebach is speaking somewhere out east, I think I just read. Wish I could go, but it would interfere with my job.
And, I can't really afford it. (Yes, yes, I am shamed, Bach walked 2oo miles to hear Buxtehude, etc, I am shamed by him. Nonetheless....)