Hi Torsten,
Very good question and one I've been asked a few times before.
To me, a mago is a mago when the Aboriginal craftsman says it is a mago. That's the simple answer. And the same thing for yi
daki too.
The acoustic characteristics of mago and yi
daki are mostly distinct, but sometimes not too dissimilar. We should keep in mind, actually, that when we say
mago, what we really mean are instruments made to be played in the overtone-absent style. And with
yidaki, instruments that are made to be played with the overtone. Having said that, Yolngu don't always play the overtone on yi
daki; for example, dja
tpangarri style. And mago instruments can also be played like yi
daki, as demonstrated by M*lk*y Mununggurr on the Korea tour instrument that was also used by Darryl Digarrnga at the Darwin Festival a couple of years ago.
So no clear-cut answers there I'm afraid buddy. However, if you are competent on both
mago and
yidaki styles of play, it isn't difficult to know when you come across a good
mago instrument or when you find a good
yidaki instrument.
I'm sure others here can help with with their experience with
mago and
yidaki
Guan