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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

Dr Theodore Marier

Guest Author · March 6, 2024

Saint Paul’s Choir School • “My Reflections”

Saint Paul’s Choir School is the only all boys Catholic choir school in the nation.

Richard J. Clark · July 26, 2023

Theodore Marier Is the Most Important Liturgical Musician—Even Today.

“The more I learn about Marier, the more I am inspired to be a better human being.” —Richard J. Clark

Jeff Ostrowski · June 30, 2023

“Six Suggestions” • Working with Volunteer Choirs

One priest on this committee said something I’ll never forget…

Jeff Ostrowski · May 11, 2023

PDF Download • Extremely Rare! Organ Accompaniment Book (165 pages)

Including an “added bonus” I discovered while researching Julius Bas (an Italian musicologist and organist).

Jeff Ostrowski · March 21, 2023

“Go!” • The Word That Changed My Life Forever

As Americans, we’re “bred from birth” to think of ourselves as little gods who already know everything and require no correction.

Jeff Ostrowski · February 23, 2023

Marier’s Majestic Music • In Singapore?

“One person I spoke to frequently—although I never met him…” (?)

Jeff Ostrowski · February 15, 2023

PDF • 2014 Dissertation: “Plainchant Influence on the Liturgical Music of Dr. Marier” (324 pages)

This treatise (324 pages) is a “must read” for anyone who cares about liturgical music in the Catholic Church.

Jeff Ostrowski · August 4, 2021

It Finally Happened.

Father Valentine used to say: “The cemeteries are full of people who thought they were indispensable.”

Follow the Discussion on Facebook

Jeff Ostrowski · June 29, 2021

“Talk Is Cheap” • Advice For Music Directors

If you fail to carefully plan your rehearsal, you’ll be eaten alive. And rightfully so!

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Jeff Ostrowski · June 15, 2021

Hymn • “Christ is King” (Father Ivor Daniel) + Rehearsal Videos!

“Once there were lost islands, but most of them have been found…”

Jeff Ostrowski · May 21, 2021

“Veni Sancte Spiritus” (Sequence) • 18 Accompaniments

The Pentecost Sequence harmonized by Father Green, Father Jones, Dom Gregory Murray, Max Springer, Achille P. Bragers, and more!

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Jeff Ostrowski · December 22, 2020

“Improving As Musicians” • Eight Suggestions

Did you know I communicate with dead Catholic composers? I’m not joking.

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Guest Author · June 7, 2020

“Comparison” • 15 Traditional Catholic Hymnals

Covid-19 has forced many parishes to remove all hymnals from their pews: A perfect opportunity for change!

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Corpus Christi Watershed

President’s Corner

    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
    2-Voice Arrangement for Lent
    Those seeking a two-voice arrangement for LENT and PASSIONTIDE should click here and scroll down. It’s based on number 775 in the Brébeuf Hymnal, with an enchanting melody written by Kevin Allen (the legendary American composer of sacred music). That text—“Pendens In Crucis Cornibus”—is often used for the Feast of our Lady of Sorrows. That link is important because, in addition to the musical score, it provides free rehearsal videos for each individual voice: something volunteer choirs appreciate!
    —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 free space which the new order of Mass gives to creativity it must be admitted, is often excessively enlarged. The difference between the liturgy with the new liturgical books, as it is actually practiced and celebrated in various places is often much greater than the difference between the old and new liturgies when celebrated according to the rubrics of the liturgical books.”

— Cardinal Ratzinger (1998)

Recent Posts

  • The Weekday Communions of Lent
  • PDF Download • “Atténde Dómine”
  • “Chant Is Not a Penitential Act” • Lenten Reflection by Daniel Marshall
  • (Ash Wednesday) • Medieval Illumination Depicting the Distribution of Ashes
  • Music List • (1st Sunday of Lent)

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