For the ad libitum chants, is there a way I can find which psalm tones they use?
Ego sum vitis vea (VIII) Gustate et videte (III) Hoc corpus (VIII) Manducaverunt (I) Panem de caelo (V) Panis quem ego dedero (I) Qui manducat carnem meam (VI)
The only real chant book I own is the PBC. No Liber, GR, any of that. The PBC does not have any information for the verses on these chants.
The verses are spelled out in the 1974 Graduale, which I think you can download from Watershed. Here are a couple to get you started:
Ego sum: Ps. 79*, 2ab. 9. 10. 11. 12. 16. 18. 19 (The asterisk means that the antiphon is not drawn from Ps. 79, and it's OK to use Ps 33 instead. See Graduale, p. 12.)
Frankly, I'm still confused about psalmody in general. The Gregorian Missal suggests trained cantors would sing the psalms with the chants, but gives no info about where to go to learn that. Is there a resource that gives the official method for psalm singing, rather than a resource that gives the psalms already set?
There is a good explanation (in Latin with simple examples) of how to set the psalm texts to the psalm-tone formulas for the eight modes, in the 1934 Antiphonale Monasticum (a free PDF download on musicasacra.com).
Those are in the 1934 book also. For instance, for "Ego sum", p. 1218 has the 8th-mode psalm tone, with several optional endings. Choose one to make the verses lead back into the antiphon.
The Psalm tones for the Gregorian Communio are the same as the Gloria Patri tones for the Versicle "Gloria Patri" at the Introit. These are available from the MusicaSacra Communio page here (transcribed, I believe, by Richard Rice). They are also in the Liber Usualis 1961, pp. 14-16.
If these ad libitum Communio antiphons are going to be sung in Latin, even in the OF, then it would seem that the appropriate Psalm tones should be those associated with them from the EF equivalents.
Thus, for example, the ad libitum "Gustate et Videte" is precisely the Communio for the 8th Sunday after Pentecost in the EF (in English, as "O Taste and See", it is the Communion antiphone for the 14th Sunday in Ordinary Time). While the rubrics don't specify the Psalm tone in the OF, I can't believe that it was envisioned that one would go out of ones way to use a different Psalm tone from the one specified for the EF equivalent.
@CHGiffen thanks for sharing that. I am thinking of composing something like this (although not a canon) for these texts, which is why I was looking for the corresponding psalm tones. Beautiful canon. My composition sense tingles with envy.
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