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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"The Sacrifice is celebrated with many solemn rites, none of which should be deemed useless or superfluous. On the contrary, all of them tend to display the majesty of this august sacrifice, and to excite the faithful, when beholding these saving mysteries, to contemplate the divine things which lie concealed in the Eucharistic Sacrifice."
— Catechism of the Council of Trent (1566)

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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: