"It [Motu Proprio] proposes to us at the same time as example and model the polyphony of the Renaissance, precisely because by its style and its interpretations of the sacred texts it is very similar to Gregorian chant. This is not to state that in this immense repertoire everything is of the same perfection, even from the liturgical viewpoint. Enough masterpieces remain, however, to make the fifteenth and sixteenth centuries one of the greatest epochs as well as one of the most fecund in all musical history.
The decadence (liturgical) begins with the seventeenth century. The causes are multiple; the Gregorian traditions become more and more a lost art; the birth of dramatic art, the development of the orchestra and of symphonic forms, the spiritual concerts, the oratorio, psalms transformed into cantatas -- everything contributes to a confusion of styles. I mean to say, considering the masses above all, that the music incorporated into the liturgical function overflows the framework of it, by its character, its dimensions, and often even by a certain fracas incompatible with the serenity, the peace of the official prayer of the Church.
That is so true that the style remains quite pure in the a cappella compositions. In the others, the passages where the voices sing alone or with simple accompaniment still retain the nobility which is called for. Too often, however, the solos or the orchestra betray the outside influence. The music enters into the Temple; it was not born there.
Always it is that this evolution brings about the mass of the spiritual concert type or cantata divided into numbers. Beyond any doubt the Mass in B Minor of Bach is one of the summits of all music. It is of dazzling craftsmanship, an incomparable richness of inspiration, an ardent piety, tender and mystic, a nobility, a grandeur which no other master has surpasses; all these qualities never cease to move us at each hearing, and even in simply reading it. The proportions of the work are, however, incompatible with the celebration of the Mass itself…"
"In sum, the musical form should always adapt itself to the form of the text. From this fundamental and fecond rule is born the definition of church polyphony. It should group us, too, in obedience to pontifical authority. As for the rest, modal or toanl style, thematic unity or variety, subjects borrowed from the Gregorian repertoire or drawn from the imagination, contrapuntal style or a harmonic one, etc., etc., I admit to having my personal preferences, but it is the form, the construction, that is to say, the composition in the etymological sense, which is the most important element, perhaps, too, the most difficult to handle.
If the reader has judged my severity regarding certain works to be excessive, I have not figured to cast doubts on their musical value, sometimes very great, nor above all exclude them from our repertoires because of certain of the their errors. I have wished only to confront them with the Motu Proprio in order to better clarify our present duty concerning this document which henceforth has the force of law, and, moreover, to facilitate our task and thus clarify the future."
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