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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

Jeff Ostrowski • Article Archive

A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004). He completed studies in Education and Musicology at the graduate level. Having worked as a church musician in Los Angeles for ten years, in 2024 he accepted a position as choirmaster for Saint Mary of the Immaculate Conception in Michigan, where he resides with his wife and children. —Read full biography (with photographs).

Jeff Ostrowski · December 5, 2017

Rorate Caeli • “Very Ancient Catholic Song”

This Catholic hymnal was written by a priest named “Police.” (not kidding)

Jeff Ostrowski · December 3, 2017

2nd Sunday of Advent (2nd of December)

Jesus began to say to the multitudes concerning John: “What went you out into the desert to see?”

Jeff Ostrowski · December 1, 2017

360º Footage of Vespers • How cool is this?

Fr. Valentine used to say: “If you don’t blow your own horn, nobody else is going to blow it for you.”

Jeff Ostrowski · November 29, 2017

Msgr. Knox • “Ten Commandments” for Crime Stories

Knox was a founding member of the “Detection Club,” which included Agatha Christie and G. K. Chesterton.

Jeff Ostrowski · November 29, 2017

PDF Download • “How To Serve Mass” (1651)

“Pausing a little, arise, make Adoration to the Sacrament, give the Pax to those present, observe Order of calling, and Years…”

Jeff Ostrowski · November 27, 2017

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Here are some books you might consider…

Jeff Ostrowski · November 27, 2017

PBS • “Gregorian Chant at the Seminary”

At the time I’m posting, this video has 355 views—let’s see if we can raise that number!

Jeff Ostrowski · November 25, 2017

Final Sunday after Pentecost (4th in November)

“And from the fig-tree learn a parable: when the branch thereof is now tender, and the leaves come forth, you know that summer is nigh.”

Jeff Ostrowski · November 25, 2017

PDF Download • “Evening Masses and Days of Obligation” (58 pages)

Permission has been given to post this marvelous 2016 dissertation by Fr. Shawn Tunink.

Jeff Ostrowski · November 24, 2017

“Simultaneous Fulfillment” of Mass Obligation?

Christmas falls on a Monday this year—but documentation shows “double dipping” is forbidden.

Jeff Ostrowski · November 20, 2017

PDF Download • Authentic Irish Hymnal (164 pages)

Imagine the amount of time required to typeset something like this!

Jeff Ostrowski · November 20, 2017

Pleni sunt coeli et terra gloria tua…

“The heavens and the earth proclaim thy glory…”

Jeff Ostrowski · November 17, 2017

Choir Members Photograph

Do you take pictures of your choir? Photographs can serve as nice reminders of wonderful experiences.

Jeff Ostrowski · November 16, 2017

A Hymn That Just Keeps Popping Up

Bach’s music inhabits “a still and serious world…without color, without light, without motion” from which we cannot break away.

Jeff Ostrowski · November 16, 2017

“23rd” {repeat} Sunday after Pentecost (3rd in November)

“…and without parables He did not speak to them; that it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables, I will utter things hidden from the foundation of the world.”

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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

Pope Gelasius in his 9th Letter to the Bishops of Lucania condemned the evil practice which had been introduced of women serving the priest at the celebration of Mass. Since this abuse had spread to the Greeks, Innocent IV strictly forbade it in his letter to the Bishop of Tusculum: “Women should not dare to serve at the altar; they should be altogether refused this ministry.” We too have forbidden this practice in the same words in Our oft-repeated constitution “Etsi Pastoralis” (§6, #21)

— Pope Benedict XIV • Encyclical “Allatae Sunt” (26 July 1755)

Recent Posts

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  • Extreme Unction
  • Which Mass?
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  • PDF Download • “Pange Lingua” in Simple (Contemporary) Polyphony for Three Voices

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