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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 · January 16, 2020

Circle is complete

This is interesting! We have made it all the way around the liturgical year for Vespers organ accompaniments—which means all we have to do now is fill in the “holes,” such as Candlemas.

Jeff Ostrowski · January 16, 2020

(2007) Fr. Valentine Young Speaks About Religious Habits In The 1960s

I desire to post more of these fascinating videos, as soon as I can find the time.

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Jeff Ostrowski · January 16, 2020

Fr. Valentine is very sick

I beg you to pray for Fr. Valentine Young, OFM, who I am told is dying (or may possibly have died already). He’s one of the most faithful & generous priests I know. There would be no CCWatershed without Fr. Valentine.

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Jeff Ostrowski · January 16, 2020

Website progress update

As of 15 January 2020, the website is still under construction. We have made progress, but there is still much to do. We thank James Doherty and Veronica Brandt for their generous assistance!

Jeff Ostrowski · January 15, 2020

What Palestrina Did With Kyrie II (“Fons Bonitatis”)

Many erroneously believe the Kyrie was the only thing troped, but that’s not even close to true.

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Jeff Ostrowski · January 14, 2020

A very serious issue

So few Catholics—even those who self-identify as “traditional” Catholics—give consideration to the sins of detraction, gossip, and libel. Some hide behind fake online identities and publish the most vile, dishonest material. Even though these hypocrites think they are “hidden,” God sees everything. By the way, never visit Twitter: it’s not a good place for one’s […]

Jeff Ostrowski · January 14, 2020

A Phenomenal Epiphany Hymn!

I wish Epiphany lasted forever—the hymns are rich with theology!

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Jeff Ostrowski · January 14, 2020

Chocolate as payment?

Church musicians realize we’re currently in tough times, but even the greatest artists did not have everything “exactly as they desired.” Vladimir Horowitz (one of the greatest pianists) was often paid for his concerts with CHOCOLATE instead of money. The Russian economy was awful, and nobody had money. But Horowitz didn’t want chocolate; he wanted […]

Jeff Ostrowski · January 7, 2020

JMO Copy (inviolable) St. Jean de Lalande Library of Rare Books

JMO Copy (inviolable) St. Jean de Lalande Library of Rare Books “The judicious searcher in this remarkable online collection will certainly reap great rewards for his effort.” — Fr. Robert A. Skeris, Benjamin T. Rome School of Music (CUA) HE SAINT Jean de Lalande Library is derived primarily from Jeff Ostrowski’s personal collection of rare […]

Jeff Ostrowski · December 31, 2019

Hymn • “A Solis Ortus Cardine” (In English)

The Church’s greatest hymn? Many believe it’s this one.

Jeff Ostrowski · December 30, 2019

PDF Accompaniment • “Jesu Redemptor Omnium”

You can compare my accompaniment to that of Achille P. Bragers.

Jeff Ostrowski · December 24, 2019

Video • “Hark! The Herald Angels Sing”

Older Catholic hymnals did funny things with this melody.

Jeff Ostrowski · December 17, 2019

“Agincourt” • Do You Know This Hymn?

I insisted that my interpretation was correct. Then she made a comment that haunts me still.

Jeff Ostrowski · December 16, 2019

Fr. Peter Gee • My First Chant Teacher

Is it just me, or does England have extremely beautiful churches?

Jeff Ostrowski · December 12, 2019

Fantastic! • “Somber Yet Powerful” Advent Hymn

It’s impossible to incorporate all the awesome Advent hymns; the season is too short.

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Corpus Christi Watershed

President’s Corner

    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
    Music List • (1st Sunday of Lent)
    Readers have expressed interest in seeing the ORDER OF MUSIC I’ve prepared for this coming Sunday—22 February 2026—the 1st Sunday of Lent (Year A). If such a thing interests you, feel free to download it as a PDF file. As always, the Responsorial Psalm, Gospel Acclamation, and Mass Propers for this Sunday are available at the outstanding feasts website alongside the official texts in Latin. I spent an enormous amount of time preparing this ORDER OF MUSIC—because the children’s choir will join us—and some of its components came out great. For example, the COMMUNION ANTIPHON with Fauxbourdon is utterly resplendent, yet still ‘Lenten’.
    —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

“Those who are trying to improve the quality of congregational singing cannot refuse to Gregorian chant the place which is due to it.”

— Sacred Congregation of Divine Worship (14 April 1974)

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