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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

PDF Download

Jeff Ostrowski · January 17, 2024

PDF Download • “Credo III + Polyphonic Extension”

When I just couldn’t take it anymore, I called up a friend on the telephone and paid him $150 to teach me.

Jeff Ostrowski · January 16, 2024

Which Hymns Are Appropriate After Christmas?

How many Catholics realize how closely the feast of the Epiphany is tied to the Holy Eucharist and Calvary?

Jeff Ostrowski · January 12, 2024

Organ Accompaniment Booklet (25 pages)

Those who celebrate VESPERS each week may wish to download my organ accompaniment booklet (25 pages) for the 2nd Sunday after Epiphany. This was originally released about a year ago (link), but minor improvements have been made.

Corpus Christi Watershed · January 10, 2024

Released • Jeff Ostrowski’s Seminar: “Secrets of the Conscientious Choirmaster” (9+ hours)

Mr. Ostrowski created this seminar based on lectures, masterclasses, and tutorials he’s presented at the Sacred Music Symposium over the last decade.

Jeff Ostrowski · January 8, 2024

PDF Download • Msgr. Hellriegel’s “Hand-Written” Hymnal (Organ Accompaniment) — 102 pages

A major announcement on 8 January 2024!

Jeff Ostrowski · December 30, 2023

Christmas • “Approached By A Famous Musicologist”

If you’re somebody who likes grandiloquence, you’ll prefer the description by Dr. Ellis.

Jeff Ostrowski · December 22, 2023

“Not Schmaltzy” • An Ancient Christmas Hymn

Sharing one’s opinions candidly is a quick way to make lifelong enemies.

Jeff Ostrowski · December 16, 2023

Our Most Popular Download Ever? • (Advent Hymn)

The more I argued, the more Kenneth insisted that none of my objections were valid…

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Jeff Ostrowski · December 12, 2023

PDF Download • “Münster Hymnal” (Harmony Edition) — 123 pages!

“As the organ plays, so does the congregation sing!” —From the Foreword

Jeff Ostrowski · December 6, 2023

(Advent, 2nd Sunday) • Introit “Pópulus Sion” Sung According to the Official Rhythm

We can hardly do better than to join in the same melodies sung by Catholic saints throughout history.

Jeff Ostrowski · December 5, 2023

PDF Download • “Lo! He comes with clouds descending” (Advent Hymn) — A Catholic Version!

Some days, Fulton J. Sheen received as many as 30,000 letters.

Jeff Ostrowski · December 1, 2023

1963 Photograph • Original Lyrics for Fr. Hellriegel’s “To Jesus Christ Our Sovereign King”

Photograph from 1963, the year Monsignor Hellriegel published his 𝐻𝑜𝑙𝑦 𝐶𝑟𝑜𝑠𝑠 𝑃𝑎𝑟𝑖𝑠ℎ 𝐻𝑦𝑚𝑛𝑎𝑙.

Jeff Ostrowski · November 29, 2023

PDF Download • “Eight Gregorian Psalm Tones” (Harmonized by Jeff Ostrowski)

Yesterday, I recorded a video demonstration of each Gregorian Chant tone.

Jeff Ostrowski · November 22, 2023

Worst Hymn Pairing Of All Time?

Are there sickening examples of hymn pairings? Oh, most certainly!

Jeff Ostrowski · November 12, 2023

(14 Examples) • Jeff Ostrowski’s Artistic “Credo”

Including several hymns eminently suitable for the feast of Christ the King.

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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

Amid all these old liturgical books, I find that I am happy and at ease; I feel at home.

— Dom André Mocquereau (1884)

Recent Posts

  • Fulton J. Sheen • “24-Hour Catechism”
  • “Reminder” — Month of Febr. (2026)
  • Seminary Music Directors Gather in Houston
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  • Dom Pothier • Photo from 1904

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Corpus Christi Watershed is a 501(c)3 public charity dedicated to exploring and embodying as our calling the relationship of religion, culture, and the arts. This non-profit organization employs the creative media in service of theology, the Church, and Christian culture for the enrichment and enjoyment of the public.