I'm not convinced taking a psalm tone and modifying the first section is the best idea.
I'm also pretty sure that if you could abbreviate the Palm Sunday Tract, Deus, Deus meus and the Tract for the First Sunday of Lent, Qui habitat., in the same manner as you have here, it would be of great help.
if you are thinking of expanding this project, do you think it might be a good idea to select a handful of Alleluias from the GR (e.g. one for each mode, or a couple for some of the modes) and stick to those ones, rather than do a new Alleluia for each Sunday/Feast?
On paper, only full propers or psalm tones or recto tono are allowed (per De musica sacra, 1958). But that restriction is in practice a dead letter: it just wasn't observed.
But if for some reason a choir cannot sing one or another liturgical text according to the music printed in the liturgical books, the only permissible substitution is this: that it be sung either recto tono, i.e., on a straight tone, or set to one of the psalm tones. Organ accompaniment may be used. Typical reasons for permitting such a change are an insufficient number of singers, or their lack of musical training, or even, at times, the length of a particular rite or chant.
Thanks for pointing that out, Adam.
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