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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:

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```E.g., D Ep F (F 20 cent flat, so actually D Ep and Ep F are
```
```the same
```
```interval)
```
```
If the musical function or intent is that these intervals should
be
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.
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```
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).
```
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Anyways the 20C flat note is not considered an accidental, not notated, inconsistently used, and
```irrelevant for notation.
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```
```
```On the other hand, if it is lowered an unspecified amount, then
when
transposed, you will need another symbol that raises an interval
so
that the sum is M-m.
```
```
```
If you look at the persian.ly 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.
```
Hans

```