So… that still leaves nine settings (II, III, V, VI, VII, XII, XIII, XIV, XV) seemingly "unaccounted for." Or make that eight settings, given what Protasius mentioned about XV. So what about the others?I — Easter
IV — Feasts of Apostles
VIII — Feasts of Ordinary Time (per "Vatican norms" — not in the GM)
IX — Marian feasts and solemnities (also Sundays of Christmas per Vatican norms)
X — Marian feasts and memorials
XI — Sundays in Ordinary Time
XVI — Weekdays in Ordinary Time
XVII — Sundays in Advent and Lent
XVIII — Weekdays in Advent and Lent, and Requiem Mass
In the modern books these chants have been grouped in order to form “Masses”, that is, collections each of which contains a Kyrie, a Gloria, a Sanctus and an Agnus Dei. Thus, there is a “Mass I” for the Easter season, a “Mass IV” for feasts of the apostles, a “Mass XI” for Sundays in Ordinary time, etc. However, we should not be deceived by these groupings. They date only from the Gregorian restoration of the nineteenth century, and only rarely do they reflect historic truth. In reality, the Kyriale constitutes a composite repertoire, of regional origin. The chants for the Ordinary of the Mass were composed in every region, and at the different times. The number of these compositions is much greater than those passed down to us in the Vatican edition. Nonetheless, the choices made for the Vatican edition are excellent. On the whole, these chants are popular in style. There are some, very simple in nature, that may be very ancient. Unfortunately, the tradition for the chants of the Ordinary is not as reliable as it is for the chants of the Proper, and, thus, we encounter numerous local variants. In several cases the influence of the schola is felt, which resulted in pieces in a more highly elaborated style.
Gloria XV has also kept the structure of a cantillation on a (mother-mode of D), in the manner of a very simple psalmodic schema (intonation - tenor - mediant - final), adjusted when the text is too short. The modal evolution is here more advanced (cadences descending a fourth), and the final amen is again adventitious.
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