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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 · September 28, 2021

Gregorian Chant • Prayer to Saint Michael the Archangel

From a rare book of Franciscan chants (1902)

Jeff Ostrowski · September 27, 2021

New CD release from the FSSP in Europe!

Christmas Matins from Bavaria…

Jeff Ostrowski · September 26, 2021

“Salve Regina” • Organ Accompaniment

Readers already realize that seventeen (17) splendid organ accompaniments for the simple “Salve Regina” can be freely and conveniently downloaded here. But what about the solemn tone for the “Salve Regina”—has anyone composed an organ accompaniment for that? Yes, Canon Jules Van Nuffel has composed one for the solemn version.

Jeff Ostrowski · September 24, 2021

“Easy Polyphonic Agnus Dei” • Part 3 of 3

The ability of your singers to sight-read music instantly does not guarantee a good performance.

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Jeff Ostrowski · September 24, 2021

“A Tale Of Two Missals”

Sometimes words are superfluous. Sometimes no commentary is needed. If you look at this Tale of Two Missals (PDF)—which compares the Canon from the “Modern” ICEL Missal with a “Dark Ages” Missal, I think you will understand exactly what I’m getting at.

Jeff Ostrowski · September 23, 2021

23 September 2021 • FEEDBACK

From a reader: “Corpus Christi Watershed is the greatest musical organization ever created in the Church!”

Jeff Ostrowski · September 21, 2021

Church “Narthex” • What’s that?

Do you know what the church narthex is? It’s kind of like a separate room, blocked off by a wall. A buddy of mine (sitting in the narthex) took some iPhone recordings of our congregation singing Vespers. Here’s how they sound sans organ. [Note: Whenever I play for Vespers, I make sure to have some […]

Jeff Ostrowski · September 21, 2021

“A Truly Eucharistic Hymn” • Christ the King (SATB)

Did Vatican II “restore” the hymns—as mandated by §93 of Sacrosanctum Concilium?

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Jeff Ostrowski · September 19, 2021

Clarion Call To All Choirmasters! • (26 Sept.)

Forty images of (IMHO) the patron saints of church musicians.

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Jeff Ostrowski · September 18, 2021

“Homily for the 17th Sunday after Pentecost” (EF) • Father Valentine Young, OFM

“In our day and age I think it is good that we all be reminded that Christ will eventually overcome his enemies.”

Jeff Ostrowski · September 16, 2021

16 September 2021 • Fulton J. Sheen

Here is a photo of Archbishop Fulton J. Sheen celebrating Mass in Jerusalem. That image was included in the “Fulton J. Sheen Sunday Missal” (1961), which was edited by Father Caramen and has an IMPRIMATUR by William Cardinal Godfrey, who served as Archbishop of Westminster from 1956 until his death in 1963. The Fulton Sheen […]

Jeff Ostrowski · September 16, 2021

15 September 2021 • Offertory Problem

I submit to you that nothing is gained by these slight variations in the repeats for the Epipany Offertory. The edition is by Carl Ott, a musicologist. Almost nothing is about Carl Ott—as far as I can tell, nobody even knows when Carl Ott was born or when Carl Ott died.

Jeff Ostrowski · September 14, 2021

PDF Download • Three Myths About Hymns

Did you know Catholics began translating hymns from Latin into the vernacular about 400 years before the Protestant Revolution?

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Jeff Ostrowski · September 10, 2021

[re-post] • “Hymn for the Feast of All Saints”

All Saints—November 1st—will be here before you know it!

Jeff Ostrowski · September 8, 2021

PDF Download • “Old Catholic Missal” (1909) … for the Schismatic “See of Utrecht”

Readers will enjoy perusing this book.

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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

“My one great desire is that during the sacred functions all the faithful should sing the melodies of the liturgy and the sacred hymns with a full voice.”

— Pope Saint Pius X

Recent Posts

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