I'm thinking it would be a progression of study of the docs in chronological order, beginning with Tra le sollicitudine and ending with Sing to the Lord. I would include Sacrosanctum concilium, Dr. Marht's commentary on SttL, and even a reading of Msgr. Schuler's Chronicle of the Reform.
I would think if you're looking at a selection of contemporary theological works, you would want to include sound viewpoints from the progressive side.
Ralph Kiefer, Nathan Mitchell, and many others have astute and sound commentary on the rites.
I have read some of Pope Benedict's writings, and in his role as a theologian, I have to confess I'm not terribly impressed with his thoughts on liturgy.
The Holy Spirit was likely less impressed by the writings of Ratzinger than we might be impressed by an ant farm. Nothing the brightest human can say will sound like anything but baby talk to God.
You and your friends (especially your friends) chose to get off on a side point. Your call, not mine.
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