I suppose this is actually a hymn/motet hybrid, with a chorus that is partially polyphonic. It is a setting of St. Ambrose's Advent hymn Veni Redemptor Gentium for SATB. A bit late for this year, but I'm sharing it in the hope that someone may be able to use it at some point.

https://www.catholicliving.net/veni-redemptor-gentium/