Can anyone tell me anything about the Advent Morning Prayer hymn Magnis prophetae vocibus? GregoBase lists the mode as D, but it could be a transposed mode VIII whose tonic is also the tenor. What might be the provenance of this hymn? The '83 Ordo does not even give a location to find it, though GregoBase says it is in the '83 Liber Hymnarius, to which I do not have access. Thanks for any info you can offer!
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