The JK article is excellent and explores the issues well.

I seem to remember Bob Davenport singing songs in pairs for a bit. When this blood war is over going into Hanging on the Old Barbed Wire I think. On hearing this I went for Close the Coalhouse Door into The Coal Owner and the Pitman's Wife, seemed a good idea at the time.

A case of suck it and see I suppose. It is always tempting to go from an air to a jig or reel they do something for each other.