About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he resides with his wife and children.
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Essentially the Missal of St. Pius V is the Gregorian Sacramentary; that again is formed from the Gelasian book which depends on the Leonine collection. We find the prayers of our Canon in the treatise “De Sacramentis” and allusions to it in the 4th century. So our Mass goes back, without essential change, to the age when it first developed out of the oldest liturgy of all. It is still redolent of that liturgy, of the days when Caesar ruled the world and thought he could stamp out the faith of Christ, when our fathers met together before dawn and sang a hymn to Christ as to a God. The final result of our enquiry is that, in spite of unsolved problems, in spite of later changes, there is not in Christendom another rite so venerable as ours.
— Fr. Adrian Fortescue (d. 1923)

Graduale Romanum Chants And The New Roman Missal
published 19 November 2012 by Jeff Ostrowski

OR SEVERAL YEARS, Christoph Tietze along with many others have been trying to explain why the antiphons in the Graduale Romanum do not always match the antiphons in the Roman Missal. I, myself, have attempted to explain this in a series of articles [url] posted on the CCW website. However, it would seem that a whole lot of confusion still exists. For instance, today on the Musica Sacra Forum (which I visit quite frequently) some correspondence with the USCCB Committee on Divine Worship was posted here [jpeg] and here [jpeg]. To make a long story short, the Committee itself does not seem to be cognizant of the reason for discrepancies between some antiphons in the Graduale Romanum and the Roman Missal. I have to admit I am surprised to hear this, because several organizations have written to the Committee about this over the years, including the Roman Catholic Cathedral Musicians [homepage], and the relevant quote from Pope Paul VI is even printed in the front of the Roman Missal, 3rd Edition.

They are certainly not alone. One of the great liturgical scholars of all time, Professor László Dobszay, did not understand why the differences exist. I say this based on my understanding of part of his 2003 article [pdf] in the Sacred Music Journal, an excerpt of which I reproduce here:

As a matter of fact, there is a very good reason why these discrepancies exist. SHORT ANSWER: the antiphons in the Roman Missal were only to be used for “Masses without music” according to Pope Paul VI.

* For those who desire to learn more, please consider reading a series of articles [url] I have posted online.