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 representative Protestant collection, entitled “Hymns, Ancient and Modern”—in substance a compromise between the various sections of conflicting religious thought in the Establishment—is a typical instance. That collection is indebted to Catholic writers for a large fractional part of its contents. If the hymns be estimated which are taken from Catholic sources, directly or imitatively, the greater and more valuable part of its contents owes its origin to the Church.
— Orby Shipley (1884)
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.