Conversation so far:
what is temps adept floridum?
The tune is that of "Tempus adest floridum" ("It is time for flowering").
what is special about the tune?
a 13th-century spring carol in 76 76 Doubled Trochaic metre first published in the Finnish song book Piae Cantiones in 1582.

Question: was this song popular?
Self-contained rewrite: was "Tempus adest floridum" popular?