The 3-part setting uses the tune Allein Gott in der Höh, a German paraphrase of the Gloria who text is by Decius and whose tune is plausibly but perhaps conjecturally attributed to him as well: it's quite similar to Gloria I. Lucis Creator could equally well be sung to any other tune in (or adaptable to) long meter, but you can also find polyphonic settings here on cpdl. Or if you have a good organ consider Frescobaldi's versetti in Toccate II.
Thanks for the great info, Richard! Asola's setting looks very intriguing, and I'm eternally grateful for the Frescobaldi Toccatas. What treasures these are!
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