Any suggestions for a polyphonic Mass Ordinary that complements the chant of Mass IX ('Cum Jubilo') and could possibly be used in alternation with the chant for some parts of the Mass?
You may be aware of a whole series of polyphonic mass settings "de Beata Virgine" by Renaissance composers based on (at least some) the melodies of Mass IX; there are ones by Victoria (a 5), Morales (a 4), Palestrina (a 6), Josquin, etc. Don't know if any would work in alternation with the chant, though the Morales looks to be one of the shorter settings.
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