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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 · August 31, 2024

Musical Lineup • (22nd Sund. Ordinary Time)

Jeff’s musical lineup for Sunday, 1 September 2024.

Jeff Ostrowski · August 30, 2024

PDF • “Lamb of God” Harmonization

Harmonized—and carefully notated—in Spanish, English, and Latin.

Jeff Ostrowski · August 30, 2024

Leaked Document! • Comparison Chart—New Responsorial Psalms (“Abbey Psalms & Canticles”)

The NAB tried to use “overly casual” language—and the results are often an abomination.

Jeff Ostrowski · August 29, 2024

“3-Voice Arrangement” (SAB) • Psalm 26

Fabulous rehearsal videos have been created for you.

Jeff Ostrowski · August 28, 2024

PDF Download • Seasonal (“Ad Libitum”) Gospel Acclamations for Sundays and Weekdays

The various options given here by the official 1970 Missal can be used during the week (or on any Sunday).

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

“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 17, 2024

Music List • (20th Sund. Ordinary Time)

This coming Sunday is 18 August 2024.

Jeff Ostrowski · August 6, 2024

PDF Download • “Entrance Chant in English” (19th Sunday in Ordinary Time)

Including twelve (12) different versions!

Veronica Brandt · August 5, 2024

Slavonic Sub Tuum: a 3 part gem of haunting beauty for your choir

An easy-peasy all-year-round Marian motet in three parts plus some reflections on typing up sheet music.

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Jeff Ostrowski · August 4, 2024

“Something Quite Odd” • Today’s Responsorial Psalm

Including a special comparison chart which shows the NAB translation vs. the “Abbey Psalms and Canticles” translation.

Jeff Ostrowski · August 2, 2024

PDF Download • “Sanctus” (Roman Missal, 3rd Ed.) in English, Latin, Spanish — Organ Accomp.

You might want to download three PDF files I composed this morning.

Jeff Ostrowski · July 31, 2024

Reminder • “Lalemant Propers” (392 Pages)

You can purchase this book in hard-copy, but many prefer to download the PDF file.

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Corpus Christi Watershed

President’s Corner

    Which Mass?
    In 1905, when the Vatican Commission on Gregorian Chant began publishing the EDITIO VATICANA—still the Church’s official edition— they assigned different Masses to different types of feasts. However, they were careful to add a note (which began with the words “Qualislibet cantus hujus Ordinarii…”) making clear “chants from one Mass may be used together with those from others.” Sadly, I sometimes worked for TLM priests who weren’t fluent in Latin. As a result, they stubbornly insisted Mass settings were ‘assigned’ to different feasts and seasons (which is false). To understand the great variety, one should examine the 1904 KYRIALE of Dr. Peter Wagner. One should also look through Dom Mocquereau’s Liber Usualis (1904), in which the Masses are all mixed up. For instance, Gloria II in his book ended up being moved to the ‘ad libitum’ appendix in the EDITIO VATICANA.
    —Jeff Ostrowski
    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

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 literal translation: “Lord, have mercy—Christ, have mercy,” does not offer much material for an acceptable song text. The words, not having any feminine syllables, are abrupt; the sounds are almost all muted and colorless; the rhythmic flow is too brief. So many people may prefer responses that further extend the song of the assembly, e.g., “Have pity on us, Lord” or “Pardon us and change our hearts.

— J. Gelineau attacking the KYRIE ELEYSON (page 64 in “Learning to Celebrate,” 1985)

Recent Posts

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  • PDF Download • “Gregorian Chant Booklet” mailed by Pope Saint Paul VI to every bishop
  • My Response Surprised A Parishioner ‘Upset’ About Latin

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