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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“It was a riveting adventure to move by degrees into the mysterious world of the Liturgy which was being enacted before us and for us there on the altar. It was becoming more and more clear to me that here I was encountering a reality that no one had simply thought up, a reality that no official authority or great individual had created. […] Not everything was logical. Things sometimes got complicated and it was not always easy to find one’s way. But precisely this is what made the whole edifice wonderful, like one’s own home.”
— Josef Cardinal Ratzinger (“Milestones” pp. 19-20) 1997

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PDF Download: Mocquereau's 1903 "Liber Usualis"
published 25 July 2014 by Jeff Ostrowski

224 Liber Usualis 1903 AY BACK in 2007, Watershed began uploading hundreds of liturgical books which were freely downloaded by Church musicians everywhere. Many of the books were (and remain) extremely rare. One of the most important books we uploaded in 2008 was a complete copy of Dom André Mocquereau’s 1903 Liber Usualis.

It seems that archive.org has followed our lead. More than half a decade later, they have scanned their own copy of Mocquereau’sbook, and made it available as a PDF file.

Surprisingly, their scan was poorly done—whereas archive.org usually does a fantastic job. In fact, the Watershed PDF is of a higher quality:

      * *  PDF Download: Solesmes Liber Usualis (1903) — «Paroissien Romain»

THIS BOOK WAS Mocquereau’s great masterpiece, and it still excellent for reference purposes. Many of his variants are more beautiful than those found in Pothier’s Editio Vaticana, such as the 1903 version of Ut Queant Laxis.