Hey all, Andrea is right on about the Caledonian being and Irish Set Dance.
Thought people might find this entertaining. From Irish Dances, ed. by Terry Moylan: "The Caledonian is the most widely danced set in County Clare, with several versions in existence there, and a few in other parts of the country. The differences between them can be slight, but enough to cause confusion should one enter a set and attempt to dance a different version from the rest of the dancers. Common courtesy, as well as common sense, would suggest that visitors establish how a set is danced in any locality before participating themselves." (1984) Sorry for the diversion. Just thought it might be of interest. Paul