My understanding is that the Gloria Patri is not sung in Lent in the EF. Yet when I look at the music for Palm Sunday in the 1962 Liber Usualis, I see that the verses for Pueri Hebraeorum include the Gloria Patri (but the Introit does not).
Is the inclusion of the Gloria Patri a mistake, or just an interesting quirk/exception?
> Is the inclusion of the Gloria Patri a mistake, or just an interesting quirk/exception?
None of that. The procession is not yet the Mass, so the Gloria Patri is said at the end of the Psalms. Then Mass begins, and the Introit has no Gloria Patri. If psalm verses are sung with the Communion, the Gloria Patri is also ommitted at the end. (It's part of Mass, that's the rule.)
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