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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 7, 2018

PDF Download • “Sunday Vespers”

…including a failed descant from 1983.

Jeff Ostrowski · May 1, 2018

PDF Download • A “Bright” Eucharistic Hymn

Could there be a nicer hymn than this? It is fresh and glorious.

Jeff Ostrowski · March 27, 2018

PDF Download • Organ Accompaniment for “Vexilla Regis” (Hymn) by Fr. Adrian Fortescue

When I saw this page, my opinion of Fortescue went down—but then I remembered…

Jeff Ostrowski · March 6, 2018

PDF Download • Rare German Hymnal (879 pages)

Most German hymnals we’ve come across contain words only—but this one has harmonies!

Jeff Ostrowski · January 28, 2018

PDF Download • “Agnus Dei” … for Lent

…including rehearsal videos for each individual voice!

Jeff Ostrowski · January 22, 2018

PDF Download • Dom Pothier Biography (1947)

“Dom Pothier himself acted as an illustrator, decorating his work with vignettes, illuminated capitals, tailpieces, even full-page illustrations representing the mysteries of the Annunciation and Christmas.”

Jeff Ostrowski · January 11, 2018

PDF Download • Easy Hymn with Melody in Tenor

The Brébeuf hymnal contains carefully chosen and flexible melodies; do you see how the following tune (“Old Hundredth”) can be used in the Tenor voice?

Jeff Ostrowski · January 8, 2018

PDF Download • Anglican Hymnal (1,151 pages)

I bet you’ve not seen this fascinating book! • Many pieces in this Anglican collection are actually translations of Roman Catholic hymns, such as Ave Maris Stella, Audi Benigne Conditor, Ad Regias Agni Dapes, and so forth • Readers will mainly be interested in sections 3 and 4 • The “Englished” versions of the propers (e.g. Puer Natus Est) are quite interesting+

Jeff Ostrowski · January 4, 2018

PDF Download • Best Hymnal Ever Printed?

If you like this, stay tuned—I’ll soon release a 1,200 page treasure!

Jeff Ostrowski · December 18, 2017

PDF Download • Kyrie “O Magnum Mysterium”

This morning, I recorded the voice parts—but please pardon my screechy soprano notes!

Jeff Ostrowski · December 13, 2017

PDF Download • “Rorate Mass” (13 pages) —Dec 2017

“Let us not be cast into the darkness to burn in flames, but may we share the joy of heaven, seeing the face of God.”

Jeff Ostrowski · December 8, 2017

PDF Download • Immac. Conception Booklet

“He whom the whole world cannot contain was enclosed in thy womb…”

Jeff Ostrowski · November 29, 2017

PDF Download • “How To Serve Mass” (1651)

“Pausing a little, arise, make Adoration to the Sacrament, give the Pax to those present, observe Order of calling, and Years…”

Jeff Ostrowski · November 25, 2017

PDF Download • “Evening Masses and Days of Obligation” (58 pages)

Permission has been given to post this marvelous 2016 dissertation by Fr. Shawn Tunink.

Jeff Ostrowski · November 20, 2017

PDF Download • Authentic Irish Hymnal (164 pages)

Imagine the amount of time required to typeset something like this!

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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

“The sun, at one moment surrounded with scarlet flame, at another aureoled in yellow and deep purple, seemed to be in an exceedingly swift and whirling movement, at times appearing to be loosened from the sky and to be approaching the earth, strongly radiating heat.”

— ‘Dr. Domingos Pinto Coelho, noted lawyer from Lisbon and chairman of the Bar Association (1917)’

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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