Although it's a hymn, are you sure it's not in 72A, Motets for 4 & 5 vv? If not perhaps the Five Spanish Liturgical Hymns (ATTB) 90A listed further down; JNR is unfortunately omitted from Das Chorwerkat IMSLP. A well stocked academic library is likely to have one of the two other Works listed at CPDL's page.
RMix- this morning I had email from Martyn Imrie at Mapa Mundi, saying they did not have it - but Maestro, YES the #5 in that IMSLP link is the polyphonic part of what I've heard THANK YOU !!! now all I have to do is find the Gregorian part of it ("it" being what was sung by the Concentus Musicus Minnesota on their CD Court and Cathedral).
For the Gregorian, so far I have only looked at GregoBase (1961 Graduale Romanum), and although they show two melodies, neither is the one I heard. but I'm on my way! Many thanks, all of you, for your help!
The Gregorian melody is indeed in the bass part of the motet as a cantus firmus, which almost exactly fits the melody from the Toledo hymns (021B), with an extension for the cadence (in the motet).
CHG - yes I saw that. thanks. could you help me understand the last part of it (measures 24-28)? In the CCM recording, SAB parts seem to be holding their notes out through these measures while the tenors sing... which is a lovely effect ... but the score doesn't seem to say they should do so. I am not sure how to read this (sorry if this is the Dumb Question for the Day)
In polyphonic music of that era, a longa as the final note in any part signified that the note was to be held until the other part(s) had finished. In a modern transcription, one might instead see the longa in each of the SAB parts replaced by six tied whole notes - six, not five, as the final longa in the T part would correspond to two whole notes (in the transcription, which replaces a semibreve in the source to be transcribed as a modern crotchet (quarter note). So, indeed, the SAB parts hold their final notes until the end.
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