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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Essentially the Missal of St. Pius V is the Gregorian Sacramentary; that again is formed from the Gelasian book which depends on the Leonine collection. We find the prayers of our Canon in the treatise “De Sacramentis” and allusions to it in the 4th century. So our Mass goes back, without essential change, to the age when it first developed out of the oldest liturgy of all. It is still redolent of that liturgy, of the days when Caesar ruled the world and thought he could stamp out the faith of Christ, when our fathers met together before dawn and sang a hymn to Christ as to a God. The final result of our enquiry is that, in spite of unsolved problems, in spite of later changes, there is not in Christendom another rite so venerable as ours.
— Fr. Adrian Fortescue (d. 1923)

Rubrics • Good Friday (Pius XII Holy Week Revisions)
published 3 April 2015 by Jeff Ostrowski

Some might find the following file helpful:

    * *  PDF Download • Rubrics for 1955 Good Friday

Always make sure to go through everything at least once beforehand—even Solesmes sometimes goofs. For example, look what they did in Chants Abrégés (1926) for Palm Sunday:

069 Solesmes Error

By the way, here’s a written-out version of the Good Friday Communion Psalm prescribed by the rubrics:

    * *  PDF Download • Good Friday Communion (Ps 21)

This is the first time it’s ever been written out! Not even the mighty—and incredible—GregoBase provides this essential score fully notated.

For the record, the Edmund Campion Hymnal has a very clear—beautifully typeset—version of Good Friday, including wonderful English translations.