I asked about this in a previous thread (sorry, I don't have the link handy) and someone pointed out that the incipit was one of only several in the Medicean editions. I've found that it works well as an intonation for chant or polyphony in practically any mode or key.I have noticed that the incipit of Gloria IV is 2nd most likely (after Gloria VIII) to be known to an average priest, so that he can sing it.
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