Conversation so far:
What is Tempus adest floridum?
Tempus adest floridum is the melody John Mason Neale's lyrics of Good King Wenceslas is set to.
What is special about the tune for Good King Wenceslas?
Tempus adest floridum is in 76 76 Doubled Trochaic metre.

Question: was this song popular?
Self-contained rewrite: Was Good King Wenceslas popular?