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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

Mark Haas • Article Archive

Mark Haas is a composer and speaker whose liturgical music has been sung in over 600 parishes and 10 countries. He lives in Florida with his wife and seven children.—Read full biography (with photographs).

Mark Haas · February 9, 2026

Solfege Volleyball: A Children’s Choir Game

“The children loved it instantly. The game required focus, teamwork, and listening.”

Mark Haas · January 23, 2026

“We don’t do that anymore.”

Don’t shoot the messenger!

Mark Haas · January 7, 2026

A Simple Way to Utilize Handbells

The method itself is wonderfully simple.

Mark Haas · December 26, 2025

Bing Crosby, Christmas, and Catholicism

He served as an unwitting catechist, introducing a young listener to the language and music of Catholicism.

Mark Haas · December 13, 2025

The “Word of the Father” Chord: Theology and Harmony Meet at Christmas

It is fitting that the most exquisite chord in Adeste Fideles coincides with the most profound line of theology.

Mark Haas · December 3, 2025

PDF Downloads • 5 Simple Palestrina Pieces

A collection of Palestrina works that are not only stunningly beautiful but also surprisingly accessible.

Mark Haas · November 20, 2025

Kid’s Repertoire • 3 Recommendations (Mark Haas)

“My children’s choir absolutely loves this piece.”

Mark Haas · November 10, 2025

What surprised me about regularly singing the Gloria in Latin

“A chorus of groans erupted: ‘Mr. Haaaaaasssss, whyyyy?'”

Mark Haas · November 4, 2025

When Pilgrims Sing, the World Disappears

“Their culture blended into the harmony of the Church. They were no longer citizens. They were Catholic.”

Mark Haas · October 28, 2025

A Practical Method of Projecting Solfege for Chant

“The choristers are not only learning the Propers more quickly but are also internalizing the sound of solfege in relation to Gregorian modes.”

Mark Haas · October 20, 2025

A Simple Way to Sing and Notate Organum Harmony

“Organum is a humble addition to Gregorian chant, yet it opens a profound sonic world.”

Mark Haas · October 10, 2025

Every Diocesan Music Commission Should Do This

“To assist this process, I have compiled links to the documents…” —Mark Haas

Mark Haas · October 1, 2025

My choir is devoid of this generation (And it’s a healthy sign)

“This unique vitality is nowhere more visible than in the choir loft.”

Mark Haas · September 22, 2025

The Old Gaffer: Parish Choir Director of Middle Earth

“Tending the garden of the liturgy so that, in God’s time, fruit may grow that is destined for eternity.”

Mark Haas · September 11, 2025

Charlie Kirk’s Fascination with Traditional Catholic Liturgy

“Charlie Kirk has repeatedly spoken about the power of traditional liturgy.”

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Corpus Christi Watershed

President’s Corner

    “Sanctus VIII” • Organ Accompaniment
    A few days ago, I composed this organ harmonization for SANCTUS VIII. This Mass is traditionally called Missa de ángelis or “Mass of the angels.” In French, it is Messe de Anges. You can evaluate my attempt to simultaneously accompany myself on the pipe organ (click here) while singing the melody. My parish is currently singing this setting.
    —Jeff Ostrowski
    Music List • (5th Sund. Ordinary Time)
    Readers have expressed interest in perusing the ORDER OF MUSIC I’ve prepared for this coming Sunday, 8 February 2026, which is the 5th Sunday in Ordinary Time (Year A). If such a thing interests you, feel free to download it as a PDF file. You will probably notice it isn’t as ‘complete’ or ‘spiffy’ as usual, owing to some difficulties which took place this week.
    —Jeff Ostrowski
    PDF • “Communion” (5th Sunday in Ordin.)
    The COMMUNION ANTIPHON for this coming Sunday, 8 February 2026—which is the 5th Sunday in Ordinary Time (Year A)—is truly delightful. You can download the musical score completely free of charge. This text will be familiar to altar boys, because it’s PSALM 42. The Feder Missal makes the following claim about that psalm: “A hymn of a temple musician from Jerusalem: he is an exile in a heathen land, and he longs for the holy city and his ministry in the Temple there. The Church makes his words her own.”
    —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

Thus the priest-celebrant, putting on the person of Christ, alone offers sacrifice, and not the people, nor clerics, nor even priests who reverently assist. All, however, can and should take an active part in the Sacrifice. “The Christian people, though participating in the Eucharistic Sacrifice, do not thereby possess a priestly power,” We stated in the Encyclical Mediator Dei (AAS, vol 39, 1947, p. 553).

— Pope Pius XII (2 November 1954)

Recent Posts

  • “Sanctus VIII” • Organ Accompaniment
  • PDF Download • Sanctus VIII Organ Accompaniment (“Mass of the Angels”)
  • Gorgeous Image of Monks Singing!
  • “Let the Choir Have a Voice” • Jeff Ostrowski’s Essay on Choral Music in the Catholic Mass
  • Solfege Volleyball: A Children’s Choir Game

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