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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 3, 2016

Musical Resources • 16th Sunday after Pentecost

“Let Thy grace, we beseech Thee, O Lord … make us to be continually zealous in doing good works.”

Jeff Ostrowski · August 30, 2016

Does Our Enlightened Age Still Need “Sacred” Music?

This short clip from “It’s a Wonderful Life” helps us understand…

Jeff Ostrowski · August 28, 2016

Beautiful Manuscript • Priest Offering Mass

I’d like to know more about this manuscript.

Jeff Ostrowski · August 27, 2016

Musical Resources • 15th Sunday after Pentecost

“Let Thy continual pity, O Lord, cleanse and fortify Thy Church…”

Jeff Ostrowski · August 25, 2016

“Simple Kyriale” for Dumb Organists Like Me!

Fr. Valentine used to say: “You can play 100 notes right, and miss just one—and people will criticize you for that wrong one!”

Jeff Ostrowski · August 25, 2016

The Eight Gregorian Psalm Tones (PDF)

I’m sick of looking for this chart online!

Jeff Ostrowski · August 24, 2016

Can You Hear The Difference?

Do you prefer polyphony recorded by just my voice, or mixed with “real” voices?

Jeff Ostrowski · August 23, 2016

“Ad Orientem” • Why I’m Rejoicing over Sloppy Errors in the Catholic Herald

His assertion that “smoking out enemies” is best done by appointing them to high positions in the Vatican is absurd.

Jeff Ostrowski · August 18, 2016

“Polyphony For Dummies”

A new video presentation with excellent audio samples.

Jeff Ostrowski · August 16, 2016

Breathtaking Images from Poland

A liturgical workshop took place in Licheń, Poland from 4-11 August 2016.

Jeff Ostrowski · August 15, 2016

Hymn for St. Thomas More & St. John Fisher

Fascinating verses by Msgr. Ronald Knox

Jeff Ostrowski · August 12, 2016

Major Media Outlet Re: “Ad Orientem”

Corpus Christi Watershed is mentioned and cited!

Jeff Ostrowski · August 12, 2016

Musical Resources • 14th Sunday after Pentecost

“May Thy Sacraments, O Lord, ever purify and fortify us…”

Jeff Ostrowski · August 11, 2016

Hymn Tunes • What’s Up With Naming Them?

Until recently, most Catholic hymnals didn’t have a metrical index!

Jeff Ostrowski · August 10, 2016

Worst Typo Of All Time?

This one got by the editor’s eye!

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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

“It is the same Church which has introduced the vernacular into the sacred liturgy for pastoral reasons, that is, for the sake of people who do not know Latin, which gives you the mandate of preserving the age-old solemnity, beauty and dignity of the choral office, in regard both to language, and to the chant.”

— Pope Saint Paul VI (15 August 1966)

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