The MIDI's on the NZ site were made by somebody recording the piece rather than carefully entering it, and they have crazy note lengths and goofy ties, the result of the computer taking literally every subtle change in pressure of the musician's fingers. The ABC's made from them are the same.

So I have copied the written music on that page into a MIDI at home, so people can both hear the piece and download it for playing on instruments at home. It is a beautiful piece.

The very low notes in the piece are not part of the melody. They are bass runs, perhaps by a ukelele. If you listen to Kiri Te Kanawa sing it, (there's a link) that becomes clear.

I have no doubt that it is an authentic piece of NZ music. It doesn't actually have a time signature - the notes match the words. It's a non-western approach to melody, and it's beautiful.

I will send my MIDI to Joe. Watch this site.

I think it would be a lovely way to end a concert and bid farewell to the audience.