I've used it on Advent III before the Hymn in Procession, and sometimes on Advent IV, too, if I have the singers in town to do it. We put the first version on YouTube, actually; would that we had the resources of Saint Paul's Cathedral!
We did actually pull it off with two men (one very good tenor) and 5 women. It was extremely effective! (we rehearsed it a lot so that everyone could find their starting pitches and the different sections.) That seemed to be the most difficult part. Cheers, Mark!
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