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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

Matthew Frederes • Article Archive

Mr. Frederes is a software engineer, pilot, served as an organist for 31 years, and directed small parish choirs/scholas for 22 years. He and his wife have 12 children. They recently moved to the Sierra foothills of Northern California. —Read full biography (with photographs).

Matthew Frederes · July 6, 2024

Bidding Starts in 4 Days on these Catholic treasures!

Christie’s Valuable Books and Manuscripts auction on July 10 will be offering a selection of important Catholic medieval and renaissance manuscripts for sale.

Matthew Frederes · May 8, 2024

J. R. R. Tolkien and Guéranger : Antiquarianism is Protestantism! Was Pius X an Antiquarianist?

The Church is a living body, that has grown from a seed to a full grown tree. It can never return to the seed.

Matthew Frederes · September 4, 2023

Revealed! • Father Enemond Massé Manuscripts of Sacred Gregorian Chant

Please enjoy this new addition to the website which provides a useful list of manuscripts discussed on this blog, for easy access to the same sources used by the contributors!

Matthew Frederes · August 8, 2023

“Graduale Romanum” • Rare Edition from 1661 A. D.

Today we release an exceedingly rare 1661 edition of the Graduale Romanum, in high resolution and in full color!

Matthew Frederes · March 6, 2023

Grant Awarded for Digitizing Over 400,000 Pages of Ancient Solesmes Manuscripts

REPERTORIUM has been awarded a large grant to scan and digitize over 400,000 ancient manuscript images from the Abbey of Saint-Pierre de Solesmes archive.

Matthew Frederes · March 4, 2023

Alfred Calabrese leads choir on EWTN with Archbishop Cordileone

Sign up today to hear Band of Voices, led by Alfred Calabrese, sing eight Latin motets on EWTN on Saturday, March 11, 2023. Archbishop Cordileone will be offering commentary as a Lenten reflection.

Matthew Frederes · March 1, 2023

Obedience In Sacred Music, Liturgy • Matthew Frederes Answers Patrick Williams

Obedience to the Church, and respect for Tradition is paramount in Sacred Music, as well as subjugation to the Liturgy. Was GR (1974) “The” Critical Edition? An incessant or insatiable thirst for variety and novelty is a vicious symptom of our modern age.

Matthew Frederes · February 27, 2023

Do We Need a Beautiful Cento, or an Archaic Reversion?

The Vatican Edition, as well as St. Gregory’s work were both a Cento built on tradition to unify the Church. Semiological editions are archaic reversions. A close look at the Puer Natus Est in both forms is offered.

Matthew Frederes · December 12, 2022

Recent Book! • “The Politics of Plainchant”

Fascinating details from never-before-seen letters recently discovered in southern France!

Matthew Frederes · November 10, 2022

Gregorian Rhythm Wars • “Frederes Feedback”

Why declare that rhythmic signs are permitted if alteration of any kind is unacceptable? It doesn’t make any sense…

Matthew Frederes · December 3, 2021

Biography • Matthew D. Frederes

In addition to being a husband and father of 12 children, Mr. Frederes is a software engineer, pilot, and served as an organist & choirmaster 33 years.

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Corpus Christi Watershed

President’s Corner

    Music List • (3rd Sund. Ordinary Time)
    Readers have expressed interest in perusing the ORDER OF MUSIC I’ve prepared for this coming Sunday: the 3rd Sunday in Ordinary Time (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 monumental feasts website alongside the official texts in Latin.
    —Jeff Ostrowski
    “Holy Name Hymn” (2-Voice Arrangement)
    When we post a direct URL link, we frequently get thousands of downloads. But when scrolling is required, very few take the time. I mention this because those who click on this URL link and scroll to the bottom can download—completely free of charge—a clever 2-voice arrangement for a famous hymn to the Most Holy Name of Jesus. In a pinch, it can be nicely sung by one male and one female! It will be of interest to those who seek arrangements for two voices.
    —Jeff Ostrowski
    PDF Download • Introit (3rd Sn. Ord.)
    This coming Sunday, 25 January 2026, is the 3rd Sunday in Ordinary Time (Year A). The ENTRANCE CHANT (“Dóminus secus mare”) is somewhat rare because it comes from the New Testament. The authentic version in Latin—of astounding antiquity—was jettisoned in 1955 but restored in 1970. This rehearsal video has me attempting to sing the melody while simultaneously accompanying myself on the organ. I encourage you to print off the organ accompaniment (PDF) and play through it because it has extremely ‘happy’ harmonies.
    —Jeff Ostrowski

Quick Thoughts

    “Reminder” — Month of January (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. Signing up couldn’t be easier: simply scroll to the bottom of any blog article and enter your email address.
    —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
    PDF Download • “In Paradisum” in English
    We always sing the IN PARADISUM in Latin, as printed on this PDF score. I have an appallingly bad memory (meaning I’d be a horrible witness in court). In any event, it’s been brought to my attention that 15 years ago I created this organ accompaniment for the famous and beautiful ‘IN PARADISUM’ Gregorian chant sung in English according to ‘MR3’ (Roman Missal, Third Edition). If anyone desires such a thing, feel free to download and print. Looking back, I wish I’d brought the TENOR and BASS voices into a unison (on B-Natural) for the word “welcome” on the second line.
    —Jeff Ostrowski

Random Quote

“The first tasks of the new pope will be to restore normality, restore doctrinal clarity in faith and morals, restore a proper respect for the law and ensure that the first criterion for the nomination of bishops is acceptance of the apostolic tradition. Theological expertise and learning are an advantage, not a hinderance for all bishops and especially archbishops.”

— Cardinal Pell (2022) about the pope who will succeed Francis

Recent Posts

  • My Ode to Kevin Allen
  • Music List • (3rd Sund. Ordinary Time)
  • PDF Download • “Tantum Ergo” for 3 Voices (Kevin Allen) Paired with a Hymn for 2 Voices
  • Choose Carefully!
  • Active Participation • “Participatio Actuosa”

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