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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

Articles

Jeff Ostrowski · December 7, 2025

“Alma Redemptóris Mater” • Everything There Is To Know About This Marian Antiphon

Including a new harmonization for the pipe organ.

Corpus Christi Watershed · December 5, 2025

(5 Dec. 2025) • Pope Leo XIV Speaks on Liturgical Music

“In the liturgy, in particular, singing is never a ‘soundtrack’, a simple backdrop, but is intended to lift the soul…” —Pope Leo XIV

Mark Haas · December 3, 2025

PDF Downloads • 5 Simple Palestrina Pieces

A collection of Palestrina works that are not only stunningly beautiful but also surprisingly accessible.

Dr. Alfred Calabrese · December 2, 2025

Dr. Alfred Calabrese • “My Invitation To You”

EWTN will broadcast the Mass later on that same evening.

Jeff Ostrowski · December 1, 2025

PDF Download • Agnus Dei Polyphonic “Choral Extension” (Simple Round by Ravenscroft)

It’s hard to banish that round once it enters your ears!

Guest Author · November 27, 2025

“Sacred Music Pilgrimage to Italy” with Grace Feltoe

Including a tour of the Pontifical Institute of Sacred Music with Father Robert Mehlhart, OP.

Jeff Ostrowski · November 25, 2025

Kid’s Repertoire • “Jeffrey’s 3 Recommendations”

Growing up, I remember hearing this adage…

Jeff Ostrowski · November 25, 2025

A Quote Worth Reading

From a mother of 11 children whose brother-in-law is a Catholic priest.

Jeff Ostrowski · November 24, 2025

PDF Download • ‘Choral Extension’ for the Sanctus (especially useful in the Ordinary Form)

It’d be easier to accept if they admitted they were explicitly contradicting Vatican II … but instead, they lied egregiously.

Mark Haas · November 20, 2025

Kid’s Repertoire • 3 Recommendations (Mark Haas)

“My children’s choir absolutely loves this piece.”

Daniel Marshall · November 18, 2025

Veni Emmanuel: An Argument for the Anglican Rhythm

The bells ring, the opening hymn rises from the organ, and you hear that haunting melody every Catholic recognizes: O come, O come, Emmanuel.

Jeff Ostrowski · November 18, 2025

PDF Download • “Hymn for Christ the King”

“Catholic parishes are slow to change their habits. They still sing what the oldest members learned at school.” —Evelyn Waugh

Jeff Ostrowski · November 16, 2025

PDF Download • “Pope Pius XII Psalter” — English, Latin, and Commentary (532 pages)

I know of no greater commentary on the psalms. Its author—an erudite Dominican priest—founded the famous “Homiletic and Pastoral Review.”

Jeff Ostrowski · November 10, 2025

Re: The People’s Mass Book (1974)

“A Man Can Kill With a Gun, a Bomb, or a Lance…”

Veronica Moreno · November 10, 2025

They did a terrible thing

When the windows were opened, men like Father Franquesa found cracks to do terrible things to sacred music.

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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

“If he converses with the learned and judicious, he delights in their talent—if with the ignorant and foolish, he enjoys their stupidity. He is not even offended by professional jesters. With a wonderful dexterity he accommodates himself to every disposition. As a rule, in talking with women (even with his own wife) he is full of jokes and banter.”

— ‘Erasmus on St. Thomas More (England’s 1st lay Chancellor)’

Recent Posts

  • Which Mass?
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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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