And that C is not playing the same role as the mixolydian flattened seventh in pipe tunes (the tune is major authentic, with several C sharps - pipes can't vary the pitch of the seventh degree).

I suspect it was inspired by the "major to minor" bit in that ghastly Cole Porter number.

It's sometimes possible to head off an impending "Ashokan Farewell" by starting "My Cape Breton Home" instead.