Thank you Thurg. Good Link. The whole thing's interesting.

The dance they're doing has retained the central figure from the earlier dances of this name, with a the dancing couple dancing a circle with one other person, and popping the spare through an arch they form at the end of the circle to progress. It has also retained the smae phrasing.Most of the other figures have changed, to make it more intersting for the supporting couples.

Stealing good tunes, or interesting figures is tradional, and one we keep up to this day.