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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 6, 2017

Holy Purity & Anger

Our seminarians and priests taught us about “captivity of the eyes.”

Jeff Ostrowski · December 6, 2017

Quickest Psalm Tone Ever Created

A nicely done Psalm Tone is preferred to a poorly sung authentic version.

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

40% savings!

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.

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Corpus Christi Watershed

President’s Corner

    Music List • (2nd Sunday of Lent)
    Readers have expressed interest in seeing the ORDER OF MUSIC I created for this coming Sunday, which is the 2nd Sunday of Lent (1 March 2026). If such a thing interests you, feel free to download it as a PDF file. This feast has magnificent propers. Its somber INTROIT is particularly striking—using a haunting tonality—but the COMMUNION with its fauxbourdon verses is also quite remarkable. I encourage all the readers to visit the feasts website, where the Propria Missae may be downloaded completely free of charge.
    —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
    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

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

“Iconographic tradition has theologically interpreted the manger and the swaddling cloths in terms of the theology of the Fathers. The child stiffly wrapped in bandages is seen as prefiguring the hour of his death: from the outset, he is the sacrificial victim, as we shall see more closely when we examine the reference to the first-born. The manger, then, was seen as a kind of altar.”

— Pope Benedict XVI (2012)

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  • Extreme Unction
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