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Corpus Christi Watershed

We’re a 501(c)3 public charity established in 2006. We have no endowment, no major donors, no savings, and run no advertisements. We exist solely by the generosity of small donors.

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Views from the Choir Loft

Flor Peeters

Jeff Ostrowski · February 28, 2025

Re: “Abuse of Catholic Church Musicians”

Listening to yourself singing isn’t fun—but it’s crucial if you wish to improve.

Jeff Ostrowski · August 14, 2024

“Missa de Angelis” • Gloria

Feel free to download this PDF file containing GLORIA VIII (“Mass of the Angels”) harmonized by the great Belgian organist: Flor Peeters.

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 · April 17, 2023

“I Came From Somewhere” • (So Did You!)

Including a haunting hymn by Flor Peeters for Eastertide.

Jeff Ostrowski · March 21, 2023

“Go!” • The Word That Changed My Life Forever

As Americans, we’re “bred from birth” to think of ourselves as little gods who already know everything and require no correction.

Jeff Ostrowski · March 9, 2023

PDF Download • Belgian “Ordinary of the Mass” (Organ Accompaniment) — 191 pages

This volume has been professionally scanned—and you’ll love the results!

Jeff Ostrowski · November 29, 2022

“Advent Hymn” • Composed by Flor Peeters

Peeters was organist at Malines Cathedral from 1923 until his death in 1986.

Jeff Ostrowski · September 13, 2022

PDF Download • 2-Voice Eucharistic Hymn by Flor Peeters (45 pages) • Includes a Descant!

Lyrics in English, with an (optional) version in Latin.

Corpus Christi Watershed · August 31, 2022

“This Hymnal Makes My Heart Sing!” —Lauren E.

“It was compiled by priests and musicians who are authentically Catholic…” — Lauren Elizabeth

Jeff Ostrowski · August 30, 2022

PDF Download • “Tantum Ergo” Two-Part Interlude (Manuals Only) by Flor Peeters

Including a stunningly gorgeous (and rare!) hymn by Flor Peeters.

Jeff Ostrowski · August 15, 2022

“Wild Accompaniment” • Flor Peeters (Kyrie VIII)

Kyrie “Missa de Angelis”—recorded yesterday by a volunteer choir.

Jeff Ostrowski · June 11, 2022

Composing Your Own Antiphons?

In the days before Vatican II, dioceses had their own special feast days.

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Corpus Christi Watershed

President’s Corner

    Luis Martínez Must Go!
    Sevilla Cathedral (entry dated 13 December 1564): The chapter orders Luis Martínez, a cathedral chaplain, to stay away from the choirbook-stand when the rest of the singers gather around it to sing polyphony—the reason being that “he throws the others out of tune.” [Excerpt from “The Life of Father Francisco Guerrero.”]
    —Jeff Ostrowski
    Urgent! • We Desperately Need Funds!
    A few days ago, the president of Corpus Christi Watershed posted this urgent appeal for funds. Please help us make sure we’re never forced to place our content behind a paywall. We feel it’s crucial that 100% of our content remains free to everyone. We’re a tiny 501(c)3 public charity, entirely dependent upon the generosity of small donors. We have no endowment and no major donors. We run no advertisements and have no savings. We beg you to consider donating $4.00 per month. Thank you!
    —Jeff Ostrowski
    “Booklet of Eucharistic Hymns” (16 pages)
    I was asked to create a booklet for my parish to use during our CORPUS CHRISTI PROCESSION on 22 June 2025. Would you be willing to look over the DRAFT BOOKLET (16 pages) I came up with? I tried to include a variety of hymns: some have a refrain; some are in major, others in minor; some are metered, others are plainsong; some are in Spanish, some are in Latin, but most are in English. Normally, we’d use the Brébeuf Hymnal—but we can’t risk having our congregation carry those heavy books all over the city to various churches.
    —Jeff Ostrowski

Quick Thoughts

    Pope Pius XII Hymnal?
    Have you ever heard of the Pope Pius XII Hymnal? It’s a real book, published in the United States in 1959. Here’s a sample page so you can verify with your own eyes it existed.
    —Corpus Christi Watershed
    “Hybrid” Chant Notation?
    Over the years, many have tried to ‘simplify’ plainsong notation. The O’Fallon Propers attempted to simplify the notation—but ended up making matters worse. Dr. Karl Weinmann tried to do the same in the time of Pope Saint Pius X by replacing each porrectus. You can examine a specimen from his edition and see whether you agree he complicated matters. In particular, look at what he did with éxsules fílii Hévae.
    —Corpus Christi Watershed
    Antiphons Don’t Match?
    A reader wants to know why the Entrance and Communion antiphons in certain publications deviate from what’s prescribed by the GRADUALE ROMANUM published after Vatican II. Click here to read our answer. The short answer is: the Adalbert Propers were never intended to be sung. They were intended for private Masses only (or Masses without music). The “Graduale Parvum,” published by the John Henry Newman Institute of Liturgical Music in 2023, mostly uses the Adalbert Propers—but sometimes uses the GRADUALE text: e.g. Solemnity of Saints Peter and Paul (29 June).
    —Corpus Christi Watershed

Random Quote

“I have, on the other hand, retained several more or less traditional tunes, absolutely valueless and without merit from a musical point of view, but which seem to have become a necessity if a book is to appeal—as I hope this one will—to the varied needs of various churches.”

— A. Edmonds Tozer (1905)

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Corpus Christi Watershed is a 501(c)3 public charity dedicated to exploring and embodying as our calling the relationship of religion, culture, and the arts. This non-profit organization employs the creative media in service of theology, the Church, and Christian culture for the enrichment and enjoyment of the public.

The election of Pope Leo XIV has been exciting, and we’re filled with hope for our apostolate’s future!

But we’re under pressure to transfer our website to a “subscription model.”

We don’t want to do that. We believe our website should remain free to all.

Our president has written the following letter:

President’s Message (dated 30 May 2025)

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