"The Cuckoo" song has surely done some flying- I know four for five melodies to which it can be sung, and Isuppose there are dozens more. I usually sing, with dulcimer accompaniment, the minor tune learned at home, but often when the family gathered of an evening, one of the boys would start it with the easier major-key version (same words, different tune). Strange- we never sang harmonies to this one- I wonder why. My own feeling is just that none of us wanted to clutter that simple melody- one you could lean into, one that was somehow part of the evening.