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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 10, 2016

PDF Download • “Rorate Mass” Booklet

Including a video snippet taken in Los Angeles.

Jeff Ostrowski · December 9, 2016

Musical Resources • 3rd Sunday of Advent (EF)

“Rejoice in the Lord always; again I say, rejoice.”

Jeff Ostrowski · December 9, 2016

Help! Why does my printer leave off the clivis?

When I print this entire booklet, the Communion inexplicably erases every clivis in the psalmody.

Jeff Ostrowski · December 8, 2016

And Now … Some Fantastic News!

Good people really do exist.

Jeff Ostrowski · December 8, 2016

PDF Download • Immac. Conception Music Booklet

Make sure to read the translation of the Offertory Hymn—so gorgeous!

Jeff Ostrowski · December 6, 2016

“Ad Orientem” • Archbishop Naumann’s Letter

“…there are, in the core of the Church’s sacramental teaching and experience, good contentions and corollary arguments to be made for both practices.” —Archbishop Naumann

Jeff Ostrowski · December 5, 2016

Lay Faithful Have Begun A Facebook Page

…for the new FSSP Apostolate in Los Angeles.

Jeff Ostrowski · December 5, 2016

Bishop of Manchester • Letter Re: “Ad Orientem”

A $12,000 reward will be given to anyone who can produce a Vatican II document mentioning “celebration facing the people.”

Jeff Ostrowski · December 2, 2016

Does Your Choir Sing Perfectly?

Why do we avoid telling the ones we love how we feel about them?

Jeff Ostrowski · December 1, 2016

Musical Resources • 2nd Sunday of Advent (EF)

“Be appeased, we beseech Thee, O Lord, by the prayers and offerings of our lowliness…”

Jeff Ostrowski · November 30, 2016

“Benedictus” • Palestrina Uses The “Dragnet” Theme!

Our Church is notoriously horrible at keeping up with cultural fads—because they’re so ephemeral.

Jeff Ostrowski · November 28, 2016

Unbelievable Track Recorded By One Voice!

I had the pleasure of meeting Mr. Pete Avendaño at the Sacred Music Symposium, held each year in Los Angeles.

Jeff Ostrowski · November 27, 2016

Musical Resources • 1st Sunday of Advent 1

“May we receive Thy mercy, O Lord, in the midst of Thy temple…”

Jeff Ostrowski · November 26, 2016

Meatless Fridays • Were We Taught Correctly?

“Ever wonder why McDonald’s decided in 1962 to put a piece of fish into a hamburger bun?” —Bishop Earl Boyea

Jeff Ostrowski · November 23, 2016

PDF Download • “Ordo Missæ” As We Use It

Do you provide something similar for your choirs?

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Corpus Christi Watershed

President’s Corner

    💲 5.00 💵
    Our tiny 501(c)3 nonprofit organization exists solely by generous readers who donate $5.00 per month. We have no endowment; we have no major donors; we run no advertisements; we have no savings. A donor wrote to us: “I so appreciate all you do and have done, and your generosity is unprecedented. I am honored to be able to make a monthly contribution.” Another monthly donor says: “Thank you for everything CC Watershed does. We are able to add so much solemnity to Holy Mass due to the resources made available here.” Can you spare a few dollars each month to help us survive?
    —Corpus Christi Watershed
    Dom Pothier • Photo from 1904
    Dom Paul Cagin, in a 1904 publication (L’oeuvre de Solesmes dans la restauration du chant grégorien) made sure to include a beautiful image of Dom Pothier, the legendary abbot of St-Wandrille. Also shown is a very young Dom André Mocquereau. Auguste Pécoul—considered the spiritual “son” of Abbat Prosper Guéranger of Solesmes—wrote as follows on 24 June 1901: “To forestall any confusion, let us remember that there is just one Gregorian notation—that restored, according to the ancient manuscripts, by the eminent Abbot of Saint-Wandrille, Dom Pothier.” ✠
    —Jeff Ostrowski
    PDF • “3-Voice Motet” (Father De Laet)
    I believe 99% of our readers will recognize this hymn tune. Perhaps Father Edgard De Laet should have called it a ‘hymn’ instead of a ‘motet for three voices’—but he’s technically correct, since MOTET is defined as: “a short piece of sacred choral music, typically polyphonic and unaccompanied.” The even verses are for three voices, as you will see if you download the PDF score at #20245. The odd verses may be song a cappella SATB or unison with organ.
    —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

“The following question is asked by the Most Reverend Lord Bishop of the Diocese of Chur: May this Diocese’s ancient custom be continued of having the Celebrant in Sung Masses (excepting more solemn Masses) intone the Credo and when he is finished reciting it going on immediately to the offertory and finishing it while the credo is being sung by the choir?” (Dubium of Dec 1909)

— 11 December 1909

Recent Posts

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  • “Reminder” — Month of Febr. (2026)
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  • Dom Pothier • Photo from 1904

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Corpus Christi Watershed is a 501(c)3 public charity dedicated to exploring and embodying as our calling the relationship of religion, culture, and the arts. This non-profit organization employs the creative media in service of theology, the Church, and Christian culture for the enrichment and enjoyment of the public.