I believe it's identical to the "Preface to the Vatican Edition" found at the front of the Liber. The PCED response to dubium no. 24 seems to affirm that "different methods" are acceptable. 25 clarifies that the text of the chant must conform to the official liturgical books.The CCW commentary states that the instructions for chanting as published in the Graduale 1908 are still in force. Does there exist a solid i.e. dependable English translation of those Latin instructions?
The signs, called rhythmica, which have been privately introduced into Gregorian chant, are permitted, provided that the force and meaning of the notes found in the Vatican books of liturgical chant are preserved.
Paragraph 59 “De Musica Sacra” (September 3rd, 1958)
The question is whether the Pontifical Commission Ecclesia Dei has the power to overturn that
Remember, too, that Fr. Zuhlsdorf has never been a Pastor; and he probably never will be
Fr. Z formerly served on the staff of PCED, so it's fair to say he is in a position to comment knowledgeably about its work
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