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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

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 · December 11, 2017

Advent Piece for 2 Voices

Multi-Track recording created by a high school sophomore.

Jeff Ostrowski · December 8, 2017

PDF Download • Immac. Conception Booklet

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

Jeff Ostrowski · December 7, 2017

“Creator Alme Siderum” (Guerrero)

The famous plainsong tune can be played on a Woofer Guitar.

Jeff Ostrowski · December 6, 2017

Quickest Psalm Tone Ever Created

A nicely done Psalm Tone is preferred to a poorly sung authentic version.

Jeff Ostrowski · December 6, 2017

Holy Purity & Anger

Our seminarians and priests taught us about “captivity of the eyes.”

Jeff Ostrowski · December 5, 2017

Rorate Caeli • “Very Ancient Catholic Song”

This Catholic hymnal was written by a priest named “Police.” (not kidding)

Jeff Ostrowski · December 3, 2017

2nd Sunday of Advent (2nd of December)

Jesus began to say to the multitudes concerning John: “What went you out into the desert to see?”

Jeff Ostrowski · December 1, 2017

360º Footage of Vespers • How cool is this?

Fr. Valentine used to say: “If you don’t blow your own horn, nobody else is going to blow it for you.”

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 29, 2017

Msgr. Knox • “Ten Commandments” for Crime Stories

Knox was a founding member of the “Detection Club,” which included Agatha Christie and G. K. Chesterton.

Jeff Ostrowski · November 27, 2017

PBS • “Gregorian Chant at the Seminary”

At the time I’m posting, this video has 355 views—let’s see if we can raise that number!

Jeff Ostrowski · November 27, 2017

40% savings!

Here are some books you might consider…

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 25, 2017

Final Sunday after Pentecost (4th in November)

“And from the fig-tree learn a parable: when the branch thereof is now tender, and the leaves come forth, you know that summer is nigh.”

Jeff Ostrowski · November 24, 2017

“Simultaneous Fulfillment” of Mass Obligation?

Christmas falls on a Monday this year—but documentation shows “double dipping” is forbidden.

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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

Tournemire could be charming or he could bite your head off. One day I could not replace him at St. Clotilde because I had a wedding to play at another church. Tournemire played on Sunday, period—that was all. He did not play weddings and so forth. (He put all that on my back.) So I went to Tournemire’s house to tell him, “Master, I am sorry but, for once, I cannot replace you. I have another obligation to fulfill.” He said, “Get out of here!” I left for good.

— Testimony of Maurice Duruflé

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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!

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President’s Message (dated 30 May 2025)

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