Are you talking about the "All together in the Floral Dance" song?
That is a 'modern' story/art song about someone finding the dancers and band at Helston, who were dancing the Furry Dance - something that has happened every year, since time immoral!
It's a great tradition and well worth a visit on 8 May. Next year it should be on a Saturday. Then you can learn the tune as played by the locals, and hear the Halanto as sung by the children (different from the Waterson version).
Robyn