I'm looking for lyrics that I've seen on the Mudcat. (Search seems to be down.) It's not in the DT under "Men and Boys."

The song I seek is a medieval song about men and boys in a monastery celebrating Christmas. It appeared in a collection published about 1561, and the collection is famous. The book has "Gaudete" in it, and also the tune later used for "Good King Wenceslas." The collection has a Latin name which I cannot remember right now.

I'm pretty sure the first three words of the lyrics were "Men and boys."

Can anybody find the thread that discussed this song and provided the lyrics?

If this takes some days and this thread goes away, please PM me.