Seriously? That's what's indicated in Versus Psalmorum et Canticorum, Gregor und Taube, www.gregorianbooks.com/propers.html, etc., and even in St. Gall 376 from the eleventh century - hardly a novelty! Do you have a resource that indicates the contrary? Similarly in the Liber when there is more than one psalm verse printed for the introit, e.g. Holy Thursday.Singing the intonation for every verse of a communion psalm is also a novelty to me.
The solemn forms of the Tones which belong to the Gospel Canticles con-
sist of the same four parts as the simpler forms which are used for the Psalms. (See the Table of Tones.) The intonations and mediations are extensions of the simple forms; the in the second half of the verse the endings are the same, but in some tones the reciting note has a slight decoration on an accented syllable if the text is of sufficient length; the accented syllable (with any that may precede it) is printed in small capitals.
The intonations have been taken into account in each verse where there are enough syllables to allow of them; when there are not, their omission is indicated by —.
It's worth noting that these are exactly the chants that repeat the intonation formula for each verse.The Commemoratio brevis calls for an exception [to the speed of singing the verses] in the canticles, the Benedictus and Magnificat, "which are sung so slowly that their antiphon should follow at the same tempo." Since the psalm verses of Introit and Communion show the same solemnity of decoration as the canticles, it follows that they too are to be sung at the same tempo as their antiphons, i.e. half the tempo of normal psalm verses. (Jan van Biezen, Rhythm, Meter, and Tempo in Gregorian Chant, tr. Kevin Rooney, p. 41. Lancelot Andrewes Press, 2016)
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