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 lives with his wife and two children.
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“If the right is given to African tribes to include their pagan traditions in the liturgy, I think the same should also be given to the rite of a thousand year-old Christian Church, based on a much older Roman tradition.”
— Professor László Dobszay

Kyrie XI • Gregorian Chant
published 11 October 2015 by Jeff Ostrowski

YRIE XI (“Orbis Factor”) is quite popular, and was specifically recommended for congregational singing in an article by Dr. William Mahrt. I confess to have wrongly neglected this chant in recent years because I prefer a more ancient version found in the “Ad Libitum” section of the Liber Usualis. I searched for a recording of this Kyrie online, but wasn’t happy with what I heard.

So here’s my attempt: