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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 · May 19, 2023

Introit • (This Coming Sunday)

Our volunteer choir appreciates training videos, so here’s my attempt at recording “Exáudi Dómine Vocem Meam,” which is the INTROIT for this coming Sunday. This coming Sunday is Dominica Post Ascensionem (“Sunday after the feast of the Ascension”). It is sung according to the official rhythm of the Catholic Church.

Jeff Ostrowski · May 19, 2023

“Daily, Daily, Sing to Mary” • (Hymn)

My colleague, Patrick Williams, has given me permission to share with our audience a recording his choir made.

Jeff Ostrowski · May 18, 2023

Sacred Music • Inspiring Letter From “Jane Doe”

Letters like this prove there are still awesome people in this world!

Jeff Ostrowski · May 17, 2023

Understanding “Bewitched” Can Help You Appreciate Classical Music

There was no explanation given for why “Darrin Stephens” was suddenly a completely different person.

Jeff Ostrowski · May 16, 2023

Gregorian Rhythm Wars • “Jeff’s Third Response to Patrick” (16 May 2023)

I don’t think our readers are interested in what we say about Gregorian rhythm—they’re interested only in what we can demonstrate.

Jeff Ostrowski · May 16, 2023

Volunteer Choir Attempts “Kýrie Eléison”

My volunteer choir attempted the polyphonic KYRIE that will be sung at this year’s Sacred Music Symposium. If you’re interested, you can listen to the live recording from last Sunday. The piece is based on the ancient plainchant hymn melody: Ave Maris Stella. Polyphony like this is truly intricate and wonderful. It reminds me of […]

Jeff Ostrowski · May 16, 2023

PDF Download • César Franck Book of Gregorian Chant Accompaniments (156 Pages)

“The organ is so universally used as an accompanying instrument today that there is a pressing need to provide a written accompaniment…” —César Franck

Jeff Ostrowski · May 16, 2023

FEEDBACK • 15 May 2023

From a reader in New Hampshire: “I just love your articles and resources! You provide an excellent resource!”

Jeff Ostrowski · May 11, 2023

PDF Download • Extremely Rare! Organ Accompaniment Book (165 pages)

Including an “added bonus” I discovered while researching Julius Bas (an Italian musicologist and organist).

Jeff Ostrowski · May 10, 2023

7 Suggestions • “Winning the Sacred Music Crusade”

If we truly believe what we say we believe, how can we allow goofy, off-Broadway, secular, casual music at Mass?

Jeff Ostrowski · May 9, 2023

Vespers Accompaniment Booklet

A VESPERS ACCOMPANIMENT BOOKLET (20 pages) for this coming Sunday—the 5th Sunday after Easter—can now be downloaded. Those who sing Vespers exactly as given in the ANTIPHONALE ROMANUM will notice that all five psalms for Eastertide are sung according to the exact same tone with the exact same differentiæ. Can someone explain why this is? […]

Jeff Ostrowski · May 7, 2023

Symposium Booklet (330 Pages)

As of 6 May 2023, anyone who wishes to may download the COMPLETED BOOKLET (330 pages) which was created for participants of Sacred Music Symposium 2023. Those who were accepted to participate in this year’s conference will be presented with their own (hard-copy) printed version of this breathtaking booklet. The faculty this year includes Professor […]

Jeff Ostrowski · May 6, 2023

6 May 2023 • FEEDBACK

Examples of comments we recently received, from all over the globe:   (1) “The Byrd composition your student sung was certainly beautiful. I cannot say how thankful I am for all that CCWATERSHED does in the world of sacred music. The videos, and recorded audios and newsletters are wonderful and beautiful. When you said that […]

Jeff Ostrowski · May 6, 2023

PDF Download • “Brief Choral Alleluia” (Suitable for the Ordinary and Extraordinary Form)

Too many priests are ignorant of the glories of authentic sacred music.

Jeff Ostrowski · May 5, 2023

PDF Download • “Vespers Accompaniment Booklet” (Fifth Sunday after Easter) — 20 pages

To recruit, teach, inspire, and retain volunteer choir members is no easy task!

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Corpus Christi Watershed

President’s Corner

    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
    Music List • (1st Sunday of Lent)
    Readers have expressed interest in seeing the ORDER OF MUSIC I’ve prepared for this coming Sunday—22 February 2026—the 1st Sunday of Lent (Year A). If such a thing interests you, feel free to download it as a PDF file. As always, the Responsorial Psalm, Gospel Acclamation, and Mass Propers for this Sunday are available at the outstanding feasts website alongside the official texts in Latin. I spent an enormous amount of time preparing this ORDER OF MUSIC—because the children’s choir will join us—and some of its components came out great. For example, the COMMUNION ANTIPHON with Fauxbourdon is utterly resplendent, yet still ‘Lenten’.
    —Jeff Ostrowski
    2-Voice Arrangement for Lent
    Those seeking a two-voice arrangement for LENT and PASSIONTIDE should click here and scroll down. It’s based on number 775 in the Brébeuf Hymnal, with an enchanting melody written by Kevin Allen (the legendary American composer of sacred music). That text—“Pendens In Crucis Cornibus”—is often used for the Feast of our Lady of Sorrows. That link is important because, in addition to the musical score, it provides free rehearsal videos for each individual voice: something volunteer choirs appreciate!
    —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

“We must say it plainly: the Roman rite as we knew it exists no more. It has gone. Some walls of the structure have fallen, others have been altered—we can look at it as a ruin or as the partial foundation of a new building. Think back, if you remember it, to the Latin sung High Mass with Gregorian chant. Compare it with the modern post-Vatican II Mass. It is not only the words, but also the tunes and even certain actions that are different. In fact it is a different liturgy of the Mass.”

— Fr. Joseph Gelineau (1978)

Recent Posts

  • The Weekday Communions of Lent
  • PDF Download • “Atténde Dómine”
  • “Chant Is Not a Penitential Act” • Lenten Reflection by Daniel Marshall
  • (Ash Wednesday) • Medieval Illumination Depicting the Distribution of Ashes
  • Music List • (1st Sunday of Lent)

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