Hm,well wouldn't like to dispute a Canadian, but we had them as 2 separate songs with 2 different tunes, one almost being an inversion of the other. We used to do "My paddle" as a 2-part round, so some people would be doing the dip-dip, while others were singing the "my paddle" line. "Land of the Siver Birch" is as in Barry's midi.