I think this is such a fine work… but the lack of an intonation to the Gloria is problematic in the context of the 1962 Missal.
I’ve heard of two potential approaches: either having the priest intone in chant and the choir then commencing the work as usual, or otherwise starting at ‘Et in terra’.
Has anyone here used this Mass with the ‘62 Missal? What has your approach been?
It'd be a shame to ruin the musical effect, but I think that repeating the text "Gloria in excelsis Deo" would be weird, if not downright forbidden (I'm not sure on that point). So your best bet would probably be for the Priest to intone using one of the "major" mode Glorias (so, VII or VIII), ending his intonation on E flat, and then the choir starts with "Et in terra".
We sing a Gloria with a similar issue, but we do it with organ accomplishment, so what happens is the Priest intones (with Gloria VIII intonation, if I remember right) and then the organ plays what would have been the choir's "Gloria in excelsis Deo" as a short fanfare/introduction, and then the choir starts with "Et in terra". It works really well with our particular Gloria, but I don't imagine that organ would work as well with the Rheinberger Mass.
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