To reiterate what others have said,as it still seems to be causing confusion. The Florsl Dance Song is a song about the Helston Furry Dance, and incorporates bits of the tune for local colour: part of it is used in the vocal melody ("all together in the floral dance") and part in instruemntals between verses.
   Peter Kennedy's publication of modern made-up Cornish words to the Helston tune confuse the issue, but arent relevant. It is also unfortunate that some time ago misguided people tried to sing the Halantow words to the Furry Dance tune, which confused things as it wasnt the old way of doing the song.