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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 · August 28, 2024

Meet Kevin Allen In Person!

If you ever wanted to spend a day with Jeff Ostrowski and Kevin Allen, next Tuesday (3-Sept-2024) is your chance! Learn more by clicking here.

Jeff Ostrowski · August 28, 2024

MONTH OF SEPTEMBER — “Reminder”

Each day I speak to folks who have followed our blog for years but (somehow) don’t realize we publish a free newsletter. Please subscribe to it! Simply scroll to the bottom of any blog article and enter your email address. We have no endowment, no major donors, no savings, and refuse to run annoyong ads. Therefore, […]

Jeff Ostrowski · August 27, 2024

When Teaching a Polyphony for the First Time, Use This Three-Voice Piece

The Solfège has already been added, and we made magnificent rehearsal videos for you!

Jeff Ostrowski · August 22, 2024

The Very Least We Can Do!

Today I must ask the infamous question… (ducks)

Jeff Ostrowski · August 20, 2024

“Entrance Chant” • For Sunday (1-Sep-2024)

Coming up fast is Sunday, 1 September 2024, which is the 22nd Sunday in Ordinary Time. Here is the PDF file of the ENTRANCE ANTIPHON—in Gregorian notation on five lines—which we’ll be singing. You can also download this organ accompaniment which corresponds to that file. If you’re somebopdy who enjoys rehearsal videos, you can listen […]

Jeff Ostrowski · August 20, 2024

“The Very Best 42 Seconds of Gregorian Chant”

Fulton J. Sheen, Saint John Mary Vianney, and more!

Jeff Ostrowski · August 19, 2024

“Our Father” • (Arr. for 3 Voices)

This tune has many names such as “Psalm 112” and “Old Hundred Twelfth.”

Jeff Ostrowski · August 19, 2024

Must This Be Accompanied?

The age-old question—will it ever be resolved?

Jeff Ostrowski · August 17, 2024

Music List • (20th Sund. Ordinary Time)

This coming Sunday is 18 August 2024.

Jeff Ostrowski · August 15, 2024

Music List • “Assumption” (15 August)

Several readers expressed interest in seeing my music list for the Assumption (15 August). You will notice the COMMUNION HYMN is a special version of “Ave Maris Stella” in English and Spanish. Our Mass on the Assumption was Tri-Lingual: Latin, English, and Spanish. Here’s the organ accompaniment (five pages) for that hymn. Furthermore, those who […]

Jeff Ostrowski · August 14, 2024

“Missa de Angelis” • Gloria

Feel free to download this PDF file containing GLORIA VIII (“Mass of the Angels”) harmonized by the great Belgian organist: Flor Peeters.

Jeff Ostrowski · August 14, 2024

Assumption Resp. Psalm (in Spanish)

Responsorial Psalm in Spanish for the feast of Our Lady’s Assumption, 15 August.

Jeff Ostrowski · August 13, 2024

15 August • “Our Lady’s Assumption”

Jeff shares a ‘quick thought’ regarding the topic of the sacred liturgy.

Jeff Ostrowski · August 9, 2024

Music List • (19th Sund. Ordinary Time)

This coming Sunday (11 August 2024) is the 19th Sunday in Ordinary Time, Year B. Some have expressed interest in seeing my “ORDER OF MUSIC.” If such a thing be appealing to you, it can be downloaded as a PDF file.

Jeff Ostrowski · August 6, 2024

MONTH OF AUGUST • “Reminder”

Each day I speak to folks who have followed our blog for years but (somehow) don’t realize we publish a free newsletter. Please subscribe to it! Simply scroll to the bottom of any blog article and enter your email address. We have no endowment, no major donors, no savings, and refuse to run annoyong ads. Therefore, […]

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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 Catholic Church has a dignity far surpassing that of every merely human society, for it was founded by Christ the Lord. It is altogether fitting, therefore, that the language it uses should be noble, majestic, and non-vernacular.”

— Blessed John XXIII (22 February 1962)

Recent Posts

  • “Reminder” — Month of Febr. (2026)
  • Seminary Music Directors Gather in Houston
  • 💲 5.00 💵
  • Dom Pothier • Photo from 1904
  • PDF Chart • “Plainsong Rhythm”

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