This is a very interesting book to have online: The 1871 Ratisbone edition of the Graduale Romanum. It has been entirely superseded by the modern Graduale Romanum, beginning in 1908 and following. Still, it is extremely interesting to have this available.
To see what was behind this edition, which prevailed for hundreds of years Trent, we turn to Johannes Berchmans Goeschl from the Summer issue of Sacred Music. He explains that the post-Trent reform efforts were driven by artistic issues rather than a concern for authenticity.
In the name of primacy of the text, the “reformers” wanted to purify the Gregorian chant of all offensive “barbarisms.” By “barbarism” they especially meant that in the inherited Gregorian chant, neume groups with several notes, or even melismas, are oftentimes placed on an unaccented syllable, while the accented syllables are oftentimes treated with only a single note. One aimed especially at the avoidance of melismas on short unaccented syllables immediately before the text accent, and also the simplification of concluding melismas.
Clarity and uniformity were to be achieved in the realm of modality, especially by ensuring that each chant begins with either the first scale degree or the reciting tone of the mode. In order to take into account modern sensibilities, many B-naturals were lowered to B-flat, and this often in modes for which the B-natural is essential to the character.
The two types of chant are indeed very different, but I suspect that some choirs might find the Medicean music easier to learn and the Latin easier to understand when sung. This is not to say that it is better. Seventeenth-century polyphony is very different from fifteenth-century and both have their place.
I am inclined to think that Early modern chant has an (and admittedly secondary) place in our repertoire of sacred music. In fact, the stylistic emphasis on accented syllables produces a chant that is more like measured music; the favoring of the flat gives a F-major feel to many pieces.
I suspect that in performance this might blend easier with polyphony than the medieval version of the music does--and at times the shift from one polyphony to chant can seem very abrupt.
I would love to hear what the reactions are if any choirs experiment with this music....
There is no rule about what music the propers must be sung to, although the official gradual is that reformed by Solesmes. We have just had a conversation about the Byrd Propers. And as you might know some choirs at EF celebrations recto-tone the propers or do them in false burdoon because they have not yet learned the propers in chant.
So just as there is nothing to prevent the singing of the Ordinary to any suitable music, so there is nothing to prevent the singing of the propers using this music.
So I vote for a new edition.
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