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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“Sacred music, being a complementary part of the solemn liturgy, participates in the general scope of the liturgy, which is the glory of God and the sanctification and edification of the faithful. It contributes to the decorum and the splendor of the ecclesiastical ceremonies, and since its principal office is to clothe with suitable melody the liturgical text proposed for the understanding of the faithful, its proper aim is to add greater efficacy to the text, in order that through it the faithful may be the more easily moved to devotion and better disposed for the reception of the fruits of grace belonging to the celebration of the most holy mysteries.”
— Pope Saint Pius X
Vatican "Blank Spaces"
published 27 December 2010 by Jeff Ostrowski

The Church Music Association of America has posted the 1961 GRADUALE ROMANUM online, and this book is a tremendous treasure for Church musicians. Looking at some of the pages, one might be led to believe that some pages were, perhaps, vandalized:

However, those who have watched these seven videos will have a different opinion. The “vandalism” was merely marking the mysterious “Vatican white notes” (as Dr. Joseph Lenards called them).

(click here) Talk on the Vatican “blank spaces” • given at Colloquium XX

“Reverse-vandalism” happens in the “pure Vaticana” books by folks like Fr. X. Mathias and Dr. Peter Wagner. There, people mark the Solesmes holds . . .

Vandalism is not always a bad thing. Josquin des Prez supposedly vandalized a pew in St. Peters (writing “Josquin was here”) and this was of infinite interest to scholars when this pew was discovered a few years back.