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.
Was Good King Wenceslas popular?
Good King Wenceslas is commonly used in popular culture.
Was Tempus adest floridum used for anything else besides popular culture?
Tempus adest floridum has also been used for the Christmas hymn Mary Gently Laid Her Child, by Joseph S. Cook

Question: did he work with anyone else?
Self-contained rewrite: Did John Mason Neale work with anyone else?