About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he resides with his wife and children.
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“To treat harmony and rhythm in this matter was a difficult matter. Facing numerous problems both large and small—that arose constantly—we understood that a flawless harmonization of Gregorian chant cannot be created by improvisation, no matter the competence and ability of the organist or harmonist.”
— Mons. Jules Van Nuffel, NOH Preface

Gregory Ceurvorst Harmonizing The Chabanel Psalms
published 11 January 2016 by Jeff Ostrowski

SAW SOMETHING COOL on YouTube. It appears Mr. Gregory Ceurvorst is singing the Chabanel Psalms with SATB harmonized verses. From what I can tell, he adapts the organ accompaniments for his singers:

Quite beautiful to hear those harmonies! If I were conducting, I might take a slightly faster tempo—but it seems like they’re singing in a large church, and sometimes the acoustic can dictate the tempo.