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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“One would be straying from the straight path were he to wish the altar restored to its primitive table form; were he to want black excluded as a color for the liturgical vestments; were he to forbid the use of sacred images and statues in Churches; were he to order the crucifix so designed that the divine Redeemer's body shows no trace of His cruel sufferings; and lastly were he to disdain and reject polyphonic music or singing in parts, even where it conforms to regulations issued by the Holy See.”
— Ven. Pope Pius XII (20 November 1947)

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.