I will admit to knowing very little about harps although the lass who played on my first LP did show me the lever system. The early harp had no such benefit but it does not devalue your post-Helen, there would not necessarily be the option to tune to the pentatonic if it were not in common usage. (That's called sticking your neck out!) Meanwhile the OP and my ramblings are better addressed by Jack Campin, who is talking about Scots Folk tunes. However his quoted references to birdsong bring us back to Fracis Beybey http://www.campin.me.uk/Music/Modes/Modes-tetrachords.abc
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