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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“Place the missal in the hand of the faithful so that they may take part more easily and more fruitfully in the Mass; and that they faithful, united with the priest, may pray together in the very words and sentiments of the Church.”
— Ven. Pope Pius XII

Can You Find The Error Here?
published 13 March 2016 by Jeff Ostrowski

This is from the 1962 Missale Romanum. Can you see the error?

676 Pius XII Psalter OOPS

For the record, neither one is a modern chant—they are both ancient.