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Corpus Christi Watershed

Pope Saint Paul VI (3 April 1969): “Although the text of the Roman Gradual—at least that which concerns the singing—has not been changed, the Entrance antiphons and Communions antiphons have been revised for Masses without singing.”

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Views from the Choir Loft

Dr. Peter Kwasniewski

A graduate of Thomas Aquinas College (B.A. in Liberal Arts) and The Catholic University of America (M.A. and Ph.D. in Philosophy), Dr. Peter Kwasniewski is currently Professor at Wyoming Catholic College. He is also a published and performed composer, especially of sacred music. Read more.

Dr. Peter Kwasniewski · September 4, 2014

Mass Among the Poor

Does it seem strange that religious orders dedicated to serving the poor would also be rediscovering the traditional Latin Mass?

Dr. Peter Kwasniewski · August 28, 2014

The Awesomeness of the Holy Sacrifice of the Mass

A Benedictine monk helps us appreciate the tremendous miracle of the Mass, which is the central point of all earthly reality.

Dr. Peter Kwasniewski · August 21, 2014

Why the Mass is the Key to the New Evangelization

We hear a lot these days about the New Evangelization, but not so much about the Holy Sacrifice of the Mass. And yet the Mass is at the very heart of our mission.

Dr. Peter Kwasniewski · August 14, 2014

Important Resources for Liturgical Reform (7 of 7)

“Who could have anticipated such a Renaissance of music-making in the desert of postmodernity? Yet this was but the first wave, and now we are enjoying a second…”

Dr. Peter Kwasniewski · August 7, 2014

St. Thomas on the “Asperges” (Sprinkling Rite)

St. Thomas did not comment specifically on the custom of sprinkling the people with holy water prior to the principal Sunday Mass; but he did explain exactly why it’s a good idea to do such a thing.

Dr. Peter Kwasniewski · July 31, 2014

Away with the World—Let Heaven Enter

Music, for a Christian, should serve the same purpose as everything else in life: weaning us from excessive attachment to this world and lifting our souls heavenward.

Dr. Peter Kwasniewski · July 24, 2014

“What Shall I Render to the Lord…”

It is impossible for us, by ourselves, to make a just return to the Lord for all He has given to us. But “with the Lord, nothing is impossible.”

Dr. Peter Kwasniewski · July 17, 2014

Basic Steps To Improve Music At Your Parish — Part 2

I have been asked to recommend some ways in which any parish in the United States could improve the music used at Mass. Some parishes may already have taken the following two steps, in which case my advice will be nugatory for them, but if your parish has not yet done so, now’s the time to begin.

Dr. Peter Kwasniewski · July 10, 2014

Pope Francis on Sound Doctrine, Memory, and Adoration

“One of the most common canards now broadcast is that Pope Francis cares but little for the sacred liturgy…”

Dr. Peter Kwasniewski · July 3, 2014

Music Rules Over Us

Music is like a food that either makes us healthy or sick; indeed, it shapes our souls in its image.

Dr. Peter Kwasniewski · June 26, 2014

On the Objectivity of the Beautiful

Can we really rank the works of fine art? Is one composer greater than another, one piece of sacred music more beautiful than another? Or is it all relative?

Dr. Peter Kwasniewski · June 19, 2014

Archbishop Sample’s Letter On Sacred Music (4 of 8)

“Everything in God’s good creation is hierarchically ordered, and the virtue of each part is to belong to the whole in the right way…”

Dr. Peter Kwasniewski · June 12, 2014

Art as Affirmation and Sacrifice

True art affirms the Catholic Faith—and represents a spiritual sacrifice pleasing and acceptable to the Lord.

Dr. Peter Kwasniewski · June 5, 2014

What the Ordinary Form Could Be: The Vienna Oratory

Have you ever wondered what a Novus Ordo High Mass might look like? Read on…

Dr. Peter Kwasniewski · May 29, 2014

The Danger of Being Arbitrary in the Liturgy

Traditional practices form a coherent whole, as they developed organically together. In many ways the liturgical reform was mechanistic and ideological.

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Corpus Christi Watershed

President’s Corner

    Which Mass?
    In 1905, when the Vatican Commission on Gregorian Chant began publishing the EDITIO VATICANA—still the Church’s official edition— they assigned different Masses to different types of feasts. However, they were careful to add a note (which began with the words “Qualislibet cantus hujus Ordinarii…”) making clear “chants from one Mass may be used together with those from others.” Sadly, I sometimes worked for TLM priests who weren’t fluent in Latin. As a result, they stubbornly insisted Mass settings were ‘assigned’ to different feasts and seasons (which is false). To understand the great variety, one should examine the 1904 KYRIALE of Dr. Peter Wagner. One should also look through Dom Mocquereau’s Liber Usualis (1904), in which the Masses are all mixed up. For instance, Gloria II in his book ended up being moved to the ‘ad libitum’ appendix in the EDITIO VATICANA.
    —Jeff Ostrowski
    Like! Like! Like!
    You won’t believe who recently gave us a “like” on the Corpus Christi Watershed FACEBOOK PAGE. Click here (PDF) to see who it was. We were not only sincerely honored, we were utterly flabbergasted. This was truly a resounding endorsement and unmistakable stamp of approval.
    —Jeff Ostrowski
    PDF Download • “Atténde Dómine”
    Although it isn’t nearly as ancient as other hymns in the plainsong repertoire, Atténde Dómine, et miserére, quía peccávimus tíbi (“Look down, O Lord, and have mercy, for we have sinned against Thee”) has become one of the most popular hymns for LENT—perhaps because it was included in the famous Liber Usualis of Solesmes. This musical score (PDF file) has an incredibly accurate version in English, as well as a nice version in Spanish, and also the original Latin. Although I don’t claim to have a great singing voice, this morning I recorded this rehearsal video.
    —Jeff Ostrowski

Quick Thoughts

    Extreme Unction
    Those who search Google for “CCCC MS 079” will discover high resolution images of a medieval Pontificale (“Cambridge, Corpus Christi College, MS 079”). One of the pages contains this absolutely gorgeous depiction of the Sacrament of Extreme Unction.
    —Corpus Christi Watershed
    PDF Chart • “Plainsong Rhythm”
    I will go to my grave without understanding the lack of curiosity so many people have about the rhythmic modifications made by Dom André Mocquereau. For example, how can someone examine this single sheet comparison chart and at a minimum not be curious about the differences? Dom Mocquereau basically creates a LONG-SHORT LONG-SHORT rhythmic pattern—in spite of enormous and overwhelming manuscript evidence to the contrary. That’s why some scholars referred to his method as “Neo-Mensuralist” or “Neo-Mensuralism.”
    —Jeff Ostrowski
    PDF • “O Come All Ye Faithful” (Simplified)
    I admire the harmonization of “Adeste Fideles” by David Willcocks (d. 2015), who served as director of the Royal College of Music (London, England). In 2025, I was challenged to create a simplified arrangement for organists incapable of playing the authentic version at tempo. The result was this simplified keyboard arrangement (PDF download) based on the David Willcocks version of “O Come All Ye Faithful.” Feel free to play through it and let me know what you think.
    —Jeff Ostrowski

Random Quote

“The priest coming nearer to the faithful; communicating with them; praying and singing with them and therefore standing at the pulpit; saying the COLLECT, the EPISTLE, and the GOSPEL in their language; the priest singing in the divine traditional melodies—the Kyrie, the Gloria, the Credo—with the faithful: these are so many good reforms that give back to that part of the Mass its true finality.”

— Archbishop Marcel Lefebvre (1965) praising vernacular readings at Mass

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