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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 · May 18, 2023

Sacred Music • Inspiring Letter From “Jane Doe”

Letters like this prove there are still awesome people in this world!

Jeff Ostrowski · May 17, 2023

Understanding “Bewitched” Can Help You Appreciate Classical Music

There was no explanation given for why “Darrin Stephens” was suddenly a completely different person.

Jeff Ostrowski · May 16, 2023

Gregorian Rhythm Wars • “Jeff’s Third Response to Patrick” (16 May 2023)

I don’t think our readers are interested in what we say about Gregorian rhythm—they’re interested only in what we can demonstrate.

Jeff Ostrowski · May 16, 2023

Volunteer Choir Attempts “Kýrie Eléison”

My volunteer choir attempted the polyphonic KYRIE that will be sung at this year’s Sacred Music Symposium. If you’re interested, you can listen to the live recording from last Sunday. The piece is based on the ancient plainchant hymn melody: Ave Maris Stella. Polyphony like this is truly intricate and wonderful. It reminds me of […]

Jeff Ostrowski · May 16, 2023

PDF Download • César Franck Book of Gregorian Chant Accompaniments (156 Pages)

“The organ is so universally used as an accompanying instrument today that there is a pressing need to provide a written accompaniment…” —César Franck

Jeff Ostrowski · May 16, 2023

FEEDBACK • 15 May 2023

From a reader in New Hampshire: “I just love your articles and resources! You provide an excellent resource!”

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 · May 10, 2023

7 Suggestions • “Winning the Sacred Music Crusade”

If we truly believe what we say we believe, how can we allow goofy, off-Broadway, secular, casual music at Mass?

Jeff Ostrowski · May 9, 2023

Vespers Accompaniment Booklet

A VESPERS ACCOMPANIMENT BOOKLET (20 pages) for this coming Sunday—the 5th Sunday after Easter—can now be downloaded. Those who sing Vespers exactly as given in the ANTIPHONALE ROMANUM will notice that all five psalms for Eastertide are sung according to the exact same tone with the exact same differentiæ. Can someone explain why this is? […]

Jeff Ostrowski · May 7, 2023

Symposium Booklet (330 Pages)

As of 6 May 2023, anyone who wishes to may download the COMPLETED BOOKLET (330 pages) which was created for participants of Sacred Music Symposium 2023. Those who were accepted to participate in this year’s conference will be presented with their own (hard-copy) printed version of this breathtaking booklet. The faculty this year includes Professor […]

Jeff Ostrowski · May 6, 2023

6 May 2023 • FEEDBACK

Examples of comments we recently received, from all over the globe:   (1) “The Byrd composition your student sung was certainly beautiful. I cannot say how thankful I am for all that CCWATERSHED does in the world of sacred music. The videos, and recorded audios and newsletters are wonderful and beautiful. When you said that […]

Jeff Ostrowski · May 6, 2023

PDF Download • “Brief Choral Alleluia” (Suitable for the Ordinary and Extraordinary Form)

Too many priests are ignorant of the glories of authentic sacred music.

Jeff Ostrowski · May 5, 2023

PDF Download • “Vespers Accompaniment Booklet” (Fifth Sunday after Easter) — 20 pages

To recruit, teach, inspire, and retain volunteer choir members is no easy task!

Jeff Ostrowski · May 4, 2023

Six (6) Pernicious Hymn Pairings

The current situation is heartbreaking.

Jeff Ostrowski · May 2, 2023

Should Chant Be Accompanied On The Organ?

As late as 1924, Dom Mocquereau mentioned Dom Desrocquettes “whose beautiful and discreet accompaniments I hear every day at Solesmes.”

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Corpus Christi Watershed

President’s Corner

    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
    PDF Download • “Hymn for 2 Voices”
    Readers who click on this video will see that it starts with verses of the “Pange Lingua” hymn by Saint Thomas Aquinas (d. 1274) arranged for two voices. However, there’s a polyphonic refrain (“Tantum Ergo”) for three voices, taken from Kevin Allen’s Motecta Trium Vocum. If your choir is very small, this piece is for you! You can download the PDF score free of charge—and you can also utilize the rehearsal videos for each individual voice—by navigating yourself to #20323.
    —Jeff Ostrowski

Quick Thoughts

    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
    “Reminder” — Month of January (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. Signing up couldn’t be easier: simply scroll to the bottom of any blog article and enter your email address.
    —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

“I have a great quarrel on with Dom Mocquereau over a very stiff book of his which we have translated & which a stupid American woman wants to be adapted to her understanding & terminology. It will be a little difficult to persuade the dear old man, for the lady is going to pay the piper. Truly money is at the root of all evils!”

— Dame Laurentia (talking about Justine Ward)

Recent Posts

  • Dom Pothier • Photo from 1904
  • PDF Chart • “Plainsong Rhythm”
  • PDF • “3-Voice Motet” (Father De Laet)
  • PDF Download • “Hymn for 2 Voices”
  • (January 2026) • “Children Singing Plainsong”

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