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Re: Persian musical koron and sori

From: Hans Aberg
Subject: Re: Persian musical koron and sori
Date: Mon, 16 Feb 2009 23:40:55 +0100

On 16 Feb 2009, at 23:14, Kees van den Doel wrote:

E.g., D Ep F (F 20 cent flat, so actually D Ep and Ep F are
the same

If the musical function or intent is that these intervals should
equal, then the note is F#pp, that is, a double koron.

Cute, I never thought of that! However it does't quite work because the *approximate* 20C fat is independent of the koron (which is *approximately* 40C). So the equation
'>' = "#p' is an exact constraint.

That is why I mentioned musical function: if it is that D Ep and Ep F- lowered should always be equal, then the note will always be F#pp, regardless what the koron is set to.

If one the other hand, it is just lowered an indefinite amount for stylistic reason not attempting to achieve equality of these intervals, then it is a different musical function, resulting in the pair independent of the koron-sori one, resulting in a new intermediate pith relative to the diatonic notation system (regardless whether you want top print them or not in the score).

Anyways the 20C flat note is not considered an accidental, not notated, inconsistently used, and
irrelevant for notation.

On the other hand, if it is lowered an unspecified amount, then
transposed, you will need another symbol that raises an interval
that the sum is M-m.

If you look at the file I sent, you will find the symbol for that I think (a blank).

So it means that you have two notational symbols, both printed as a blank: in a transposed situation, you may have to use the other. It is not very intuitive - so even though it is not explicitly notated, it might be good to be able to do so.


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