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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

    PDF Download • “Atténde Dómine”
    Although it isn’t nearly as ancient as other hymns in the plainsong repertoire, Atténde Dómine, et miserére, quía peccávimus tíbi (“Look down, O Lord, and have mercy, for we have sinned against Thee”) has become one of the most popular hymns for LENT—perhaps because it was included in the famous Liber Usualis of Solesmes. This musical score (PDF file) has an incredibly accurate version in English, as well as a nice version in Spanish, and also the original Latin. Although I don’t claim to have a great singing voice, this morning I recorded this rehearsal video.
    —Jeff Ostrowski
    Music List • (1st Sunday of Lent)
    Readers have expressed interest in seeing the ORDER OF MUSIC I’ve prepared for this coming Sunday—22 February 2026—the 1st Sunday of Lent (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 outstanding feasts website alongside the official texts in Latin. I spent an enormous amount of time preparing this ORDER OF MUSIC—because the children’s choir will join us—and some of its components came out great. For example, the COMMUNION ANTIPHON with Fauxbourdon is utterly resplendent, yet still ‘Lenten’.
    —Jeff Ostrowski
    2-Voice Arrangement for Lent
    Those seeking a two-voice arrangement for LENT and PASSIONTIDE should click here and scroll down. It’s based on number 775 in the Brébeuf Hymnal, with an enchanting melody written by Kevin Allen (the legendary American composer of sacred music). That text—“Pendens In Crucis Cornibus”—is often used for the Feast of our Lady of Sorrows. That link is important because, in addition to the musical score, it provides free rehearsal videos for each individual voice: something volunteer choirs appreciate!
    —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

An Indult of the “Commission for Russia” (25 November 1929) authorizes Bishops and Administrators Apostolic in Russia to permit the celebration of Mass and the reception of Holy Communion in the afternoon or evening, on condition that a Eucharistic fast of four hours from noon be observed.

— Sacred Congregation of Rites, 25 nov 1929

Recent Posts

  • The Weekday Communions of Lent
  • PDF Download • “Atténde Dómine”
  • “Chant Is Not a Penitential Act” • Lenten Reflection by Daniel Marshall
  • (Ash Wednesday) • Medieval Illumination Depicting the Distribution of Ashes
  • Music List • (1st Sunday of Lent)

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