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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

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Corpus Christi Watershed · December 6, 2025

Pope Leo XIV on Sacred Music

On 5 December 2025, the pope said…

Jeff Ostrowski · December 4, 2025

PDF • “Music List” (Immaculate Concep.)

Readers have expressed interest in examining the music list I prepared for 8 December (“In Conceptione Immaculata Beatae Mariae Virginis”).

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.

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!

Corpus Christi Watershed · November 27, 2025

“Translations Approved for Liturgical Use”

There are three (3) translations of the Bible which can be used in the sacred liturgy.

Jeff Ostrowski · November 27, 2025

Dr. Mahrt explains the ‘Spoken’ Propers

This image is found on the first page of a 1974 Sacramentary.

Jeff Ostrowski · November 25, 2025

PDF • “Music List” (1st Sunday of Advent)

Readers have expressed interest in examining the “music list” I prepared for this coming Sunday.

Jeff Ostrowski · November 25, 2025

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

Growing up, I remember hearing this adage…

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.”

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 17, 2025

“Music List” • Christ the King Sunday

Readers have expressed interest in examining the “music list” I prepared for this coming Sunday.

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 15, 2025

“Simplified” Keyboard Accompaniment (PDF)

A simplified keyboard accompaniment for the “O Jesus Christ, Remember” hymn.

Jeff Ostrowski · November 10, 2025

Re: The People’s Mass Book (1974)

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

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Corpus Christi Watershed

President’s Corner

    Particularly Beautiful
    The 2nd Sunday of Lent has magnificent propers. Its INTROIT is particularly striking—using a haunting tonality—but the COMMUNION with fauxbourdon verses is also quite remarkable. I encourage all the readers to visit the feasts website, where the Propria Missae may be downloaded completely free of charge.
    —Jeff Ostrowski
    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

Quick Thoughts

    Extreme Unction
    Those who search Google for “CCCC MS 079” will discover high resolution images of a medieval Pontificale (“Cambridge, Corpus Christi College, MS 079”). One of the pages contains this absolutely gorgeous depiction of the Sacrament of Extreme Unction.
    —Corpus Christi Watershed
    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

“In condemning us, you condemn all your own ancestors—all the ancient priests, bishops and kings—all that was once the glory of England, the island of saints and the most devoted child of the See of Peter. For what have we taught, however you may qualify it with the odious name of treason, that they did not uniformly teach?”

— Father Edmund Campion (to the Anglicans about to murder him)

Recent Posts

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  • Which Mass?
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