Re: Persian musical koron and sori

[Hans Aberg]

On 16 Feb 2009, at 23:35, Kees van den Doel wrote:

> > If you look at the persian.ly file I sent, you will find the
> > symbol for that I think (a blank).
>
> On the other hand if you meant not the glyph but the input suffix...

Perhaps an unfortunate choice of word: as a musical function,  
regardless whether it is notated.

> ...you're right that I need to define
> also "flat-20C", e.g. in G Ap Bb, with Bb 20C flat. I don't see why  
> I should need something else
> to raise an interval, can you show me an example?

D# E#p F-raised - I just added a sharp to your example.

I know what makes the underlying theory. Start with minor (resp.  
major) second m (resp M), which generates sharps and flats with  
interval M-m. Then add a neutral second: one needs symbols to get from  
m to n (example: sori) and from M to n (example: koron).

So each n generates a symbol pair. This has to do with the notation  
system expresses all pitches of the form p m + q M, where p, q run  
through the integers. By adding the the symbol pairs, one can also  
express p m + q M + r n, where the integer r >= 0.

If one wants r < 0, then one need another pair of symbols. This  
happens in Turkish music. The reason is that when one divided the  
perfect fourth symmetrically as n P n, instead of the Persian n P m.

So I just think of that theory, and know that some transposition will  
generate those symbols. They may not be used in practice, but without  
them, one may end up in a situation where they might be needed.

  Hans