Could Baz or someone explain what that approach actually does? Do ABCMUSIC and ABC2H take the melody and come up with chords that fit it? That's a neat trick.

But anyway, John, in my opinion it's really not that hard to learn to read music and identify simple 3- or 4-note chords yourself. (I have to admit I learned when I was little and learning was easy.) In something by a famous harpist there may well be more complicated chords than the basic triads and sevenths, but probably no computer program would name those right either.