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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 · June 10, 2019

PDF Download • Vespers Organ Accompaniments

Do you understand why some of the harmonies are blank?

Jeff Ostrowski · June 4, 2019

PDF Download • “Magnificat” + Rehearsal Videos!

“You think I’m kidding, but I’m not. I know of no greater piece than this.” —Jeff Ostrowski

Jeff Ostrowski · May 23, 2019

PDF Download • Palestrina “Gloria” w/ practice videos!

Careful: the Alto line is surprisingly difficult!

Jeff Ostrowski · May 17, 2019

PDF Download • Franz Liszt and Gregorian Chant

Many would ask: “What is the purpose of posting such books? Are we supposed to sing from them?” • It turns out, these editions help us understand the journey of Franz Liszt to understand Gregorian modality.

Jeff Ostrowski · May 2, 2019

PDF Download • Complete Kyriale on Modern Staves!

If you can read treble clef, you can read this edition … a brilliant idea!

Jeff Ostrowski · April 20, 2019

PDF Download • “Cheat Sheet” for Easter Vigil

Releasing this is probably a bad idea…too late!

Jeff Ostrowski · April 19, 2019

PDF Download • Organ Interludes for Manuals!

I will most definitely be playing these pieces—based on hymn tunes—by Georg Philipp Telemann!

Jeff Ostrowski · April 8, 2019

PDF Download • Spectacular “Tenebrae” Booklet

Mr. Albert Bloomfield has done us a breathtaking favor.

Jeff Ostrowski · April 4, 2019

PDF Download • Mystery Kyriale (100 Pages)

Nobody knows the author or date of publication.

Jeff Ostrowski · January 22, 2019

PDF Download • “Chant Service Book” (208 pages)

An extremely rare book from 1941, containing all your favorite Gregorian chants!

Jeff Ostrowski · December 22, 2018

PDF Booklet • Christmas Midnight Mass (36 pages)

It looks so simple when placed in a booklet like that…

Veronica Brandt · December 1, 2018

PDF Download • “Easy Organ Interludes” (229 pages)

Giovanni Battista Fasolo published an enormous book of organ interludes without pedals • Pierre Gouin typed them up, bringing you this clear window into renaissance liturgical music for free! • Enjoy this treasure trove of organ music from almost 400 years ago! Plus a few highlights from along the way+

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Jeff Ostrowski · November 15, 2018

PDF Download • Mass Hymns by Fr. Seed, SJ (1906)

How utterly strange to see such items!

Jeff Ostrowski · November 6, 2018

PDF Download • “Pope Pius XII Hymnal” (1959)

Were you shocked to see the Pius XII Hymnal assigning vernacular hymns to different parts of the Mass?

Jeff Ostrowski · October 30, 2018

“Source Material” • The Saint Jean de Brébeuf Hymnal

We assembled a staggering number of Catholic hymnals and selected only the very best material from each.

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Corpus Christi Watershed

President’s Corner

    Simplified Accomp. • Schubert’s “Ave Maria.”
    Sometimes the organist must simultaneously serve as the CANTOR. (Those who work in the field of church music know exactly what I’m talking about.) One of our contributors composed this simplified keyboard accompaniment for Franz Schubert’s “Ave Maria,” a piece which is frequently requested for Catholic funerals and weddings. In terms of the discussion about whether that piece is too theatrical (‘operatic’) for use in Church, I will leave that discussion to others. All I know is, many church musicians out there will appreciate this simplified version.
    —Jeff Ostrowski
    “Reminder” — Month of April (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
    Simplified Accompaniment (Easter Hymn)
    Number 36 in the Brébeuf Hymnal is “At the Lamb’s high feast we sing,” an English translation for Ad Cenam Agni Próvidi (which was called “Ad Régias Agni Dapes” starting 1631). As of this morning, you can download a simplified keyboard accompaniment for it. Simply click here and scroll to the bottom. Many organists are forced to serve simultaneously as both CANTOR and ACCOMPANIST. In spite of what some claim, this can be difficult—which explains why choirmasters appreciate these simplified keyboard accompaniments. Sadly, many readers will click that link but forget to scroll to the bottom where the simplified PDF file is located.
    —Jeff Ostrowski

Quick Thoughts

    PDF Download • “Anima Christi”
    I received a request for an organ accompaniment I created way back in 2007 for the “Anima Christi” Gregorian Chant. You can download this PDF file which has the score in plainsong followed by a keyboard accompaniment. Many melodies have been paired with “Anima Christi” over the centuries, but this is—perhaps—the most common one.
    —Jeff Ostrowski
    PDF • “Liturgical Law” (467 Pages)
    On Good Friday during the middle ages, the pope privately recited THE ENTIRE PSALTER. If you don’t believe me, see for yourself by reading this passage by Dom Charles Augustine Bachofen (d. 1943). His famous book—called “Liturgical Law: A Handbook Of The Roman Liturgy”—was published by the Benjamin Herder Book Company, which was the American arm (operating out of St. Louis, Missouri) of one of the world’s most significant Catholic publishers. Dom Charles Augustine Bachofen was born in Switzerland but spent his career between the Benedictine monasteries at Conception (Missouri) and Mount Angel (Oregon). His 1931 masterpiece, Liturgical Law can be downloaded as a PDF file … 467 pages!
    —Jeff Ostrowski
    “Gregorian Chant Quiz” • 24 March 2026
    How well do you know your Gregorian hymns? Do you recognize the tune inserted into the bass line on this score? For many years, we sang the entire Mass in Gregorian chant—and I mean everything. As a result, it would be difficult to find a Gregorian hymn I don’t recognize instantly. Only decades later did I realize (with sadness) that this skill cannot be ‘monetized’… This particular melody is used for a very famous Gregorian hymn, printed in the LIBER USUALIS. Do you recognize it? Send me an email with the correct words, and I promise to tell everybody I meet about your prowess!
    —Jeff Ostrowski

Random Quote

“It would be difficult to find a failure of imagination greater than that of Carl Czerny.”

— Robert Schumann

Recent Posts

  • Every Artist Needs a Refuge
  • Simplified Accomp. • Schubert’s “Ave Maria.”
  • “The Unselected Hymn” • Do You Recognize It?
  • 2026 Sacred Music Pilgrimage (Washington DC) • With Richard J. Clark
  • “Reminder” — Month of April (2026)

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