PDF Download • Palestrina Kyrie “Fons Bonitatis”

Jeff Ostrowski · September 20, 2019

E HAVE ADDED rehearsal videos for the first section of a Palestrina Mass—section 1 of 3. Soon, we will add the missing sections. You can find it as #81668 at the Lalemant Polyphonic tome. Naming the files is always difficult. Palestrina based the Mass upon what we now refer to as “Mass II”—but the Masses were not numbered the same way when Palestrina was alive as they are now. Perhaps the easiest and most accurate name would be Kyrie Fons Bonitatis. Giovanni Pierluigi da Palestrina called the Mass: IN MAJORIBUS DUPLICIBUS.

* * PDF Download • Kyrie (1 of 3) (#81668)

EQUAL VOICES : YouTube • Mp3 Labeled

SOPRANO : YouTube • Mp3 Labeled

ALTO : YouTube • Mp3 Labeled

TENOR : YouTube • Mp3 Labeled

BASS : YouTube • Mp3 Labeled

This little piece is harder than it looks, by the way—so be on your guard!

Opinions by blog authors do not necessarily represent the views of Corpus Christi Watershed.

About Jeff Ostrowski

Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004). He resides with his wife and children in Michigan. —(Read full biography).

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

“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

“Latin has been the language of the Latin liturgy for 1,600 years. It is a sign and source of unity as well as a defense of doctrine, not because of the language so much, but because it is a language no longer subject to changes. There are so many beautiful texts which can never have the same effectiveness in translation. Lastly, Latin is bound to an extremely precious heritage of melody, Gregorian chant and polyphony.”

— Cardinal Antonelli (Secretary of the Conciliar Commission on the Liturgy)

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About Jeff Ostrowski