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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 · April 6, 2022

“Victimæ Paschali Laudes” • Nineteen (19) Organ Accompaniments

Including a remarkable musical setting by Father Adrian Fortescue (d. 1923).

Jeff Ostrowski · April 5, 2022

Free Organ Accompaniment • “Vexilla Regis”

During Passiontide, the hymn at Vespers is the mighty Vexilla Regis Prodeunt of Bishop Venantius Fortunatus. In 2015, I composed an organ accompaniment for this hymn with each verse written out. This comes in pretty handy on occasions when the organist must “lead the hymn from the organ bench.” Please feel free to download my […]

Jeff Ostrowski · April 2, 2022

“Hymn To Saint Joseph” • (Rec. 4/2/2022)

Certainly the only “Eucharistic” hymn to Saint Joseph I know!

Jeff Ostrowski · April 1, 2022

Gregorian Chant • “Its True & Authentic Rhythm”

For this coming Sunday (Passion Sunday), there’s only one “MMV” singers must observe—and I placed a little arrow above it.

Jeff Ostrowski · March 31, 2022

Cardinal Schönborn Consecrates “IKEA Altar”

When Father Fortescue was diagnosed with cancer, he was seen to kiss devoutly the Altar on which he had so frequently celebrated Mass before going to the hospital to die.

Jeff Ostrowski · March 25, 2022

PDF Download • “Missa Philomena” (Philippe Verdelot) — Part 1 has been added.

We already released Part 2; today we release Part 1.

Jeff Ostrowski · March 24, 2022

“Extraordinary Form” • Is This Name Still Allowed?

Fulton J. Sheen reminded us: “Many a pontiff goes through life without making a single infallible decision … not one.”

Jeff Ostrowski · March 20, 2022

“Ah, Holy Jesus” • Lent + Passiontide Hymn

Mr. Currie complained about hymn lyrics that “unduly emphasize the human nature of the Savior.”

Jeff Ostrowski · March 20, 2022

Names Have Been Revealed!

The clinicians for Sacred Music Symposium 2022 have been officially released! You can see them by downloading this PDF file. Please help us spread the word. Thank you!

Jeff Ostrowski · March 15, 2022

“Three Hymns for Lent” • (Rec. 03/10/2022)

Sometimes what goes without saying must be said.

Jeff Ostrowski · March 13, 2022

PDF Download • “Audi Benigne Conditor” (Organ Accompaniment)

Finding the “perfect” accompaniment for hymns can be challenging. Here’s my attempt.

Jeff Ostrowski · March 9, 2022

“Church Music” • Opportunity of a Lifetime!

We’ve streamlined our application process; register online today!

Jeff Ostrowski · March 9, 2022

PDF • “Hymn Suggestions For Each Sunday”

The conscientious choirmaster takes people where they are and then—carefully and prudently—leads them to something higher.

Jeff Ostrowski · March 8, 2022

Surprise! • Bas PDF from Paris

A generous person in Paris sent us the 1921 organ accompaniment to the Requiem Mass (“Missa Pro Defunctis”) harmonized by Julius Bas, who was associated with the Abbey of Solesmes. You can download the entire PDF file for free at the Lalande Library. I must say, what Bas does with Dies Irae sequence is fascinatingly […]

Jeff Ostrowski · March 8, 2022

“Like None Other!” • New Three-Voice Collection

I could not function as a choirmaster without this collection.

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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

    “Reminder” — Month of Febr. (2026)
    On a daily basis, I speak to people who don’t realize we publish a free newsletter (although they’ve followed our blog for years). We have no endowment, no major donors, no savings, and refuse to run annoying ads. As a result, our mailing list is crucial to our survival. It couldn’t be easier to subscribe! Just scroll to the bottom of any blog article and enter your email address.
    —Jeff Ostrowski
    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

“Now we are aware of the fact that during recent years some artists, gravely offending against Christian piety, have dared to bring into churches works devoid of any religious inspiration and completely at variance with the right rules of art.”

— Ven. Pope Pius XII (25 December 1955)

Recent Posts

  • Which Mass?
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