Key: A major (you may prefer to move it up to B if you have a high school choir)
Complexity: robust for a community choir
Dufay wrote this for two voices and two trombones. The two voices are in canon, and the two trombones have a similar interaction, although their interplay is a little more interesting. I thought it would convert to SATB easily enough and set some fitting text - which is why I've shared it here. Today I discovered via youtube that many choirs have had the same idea - and converted this to four voices. Of course. Google is always humbling eh?
It's just a joyous piece. And the interplay of the parts will be downright fun to sing. Enjoy!