M. Jackson Osborn, in this discussion, brought my attention to the Modus Cantandi Alleluia (p. 825ff in my Graduale Triplex). What exactly is this? I first thought it was alternate Alleluias to be sung in place of the antiphons during Paschaltide, but then I thought maybe it would be addendum Alleluias for the antiphons themselves in that season. However, that doesn't make sense, since they end with Alleluias already. Any illumination on the subject?
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