Re: Diatonic notation system

[Hans Aberg]

On 10 Dec 2008, at 16:26, Graham Breed wrote:

> > > You can uncomment anything you like now because the
> > > rational numbers are accepted.
> >
> > Fine.
>
> But if you try and do \key d \bayati you'll get that error.

OK. I don't remember. It works in E24, though.

> > > I've checked the documentation for key
> > > signatures and see no indication that \key b \bayati could possible
> > > work though.
> >
> > In E12, I use key signatures like
> >  hitzaz = #`(
> >  (0 . 0)
> >  (1 . ,FLAT)
> >  (2 . 0)
> >  (3 . 0)
> >  (4 . 0)
> >  (5 . ,FLAT)
> >  (6 . ,FLAT)
> >  )
> > ...
> >  \tempo 4 = 144
> >  \key b \hitzaz
> >  \time 7/16
> > and they work just fine.
>
> That's nice.  But the documentation clearly says "To create
> non-standard key signatures, set this property directly."
> Surprisingly enough an undocumented alternative doesn't work.

I am not sure what this means. One can some different things, how it  
should be displeyed in octaves. This worked though.

> > It would be the same, but for intermediate pitches. In Turkish and  
> > Arab
> > music they may give a transposition a new name, but in Farhat had
> > transpositions in Persian music.
>
> What?

Farhat writes the same dastgah in different keys, with different key  
signatures. In Arab music, one may give it a new name. But on  
Maqamworld, they do speak about maqam in different keys.

> > I keep saying that it was a feature, not a bug, due to the  
> > development
> > history. You keep returning to it, creating noise.
>
> You haven't said it was a feature before.  Why do you say it's a  
> feature now?

I feature is a bug that is intentional; they know it, and may fix it,  
if they have time.

> One interesting thing is that if I make the key signature
>
>   \set Staff.keySignature =  #`(
>     (2 . ,HALFFLAT)
>     ((0 . 6) . ,FLAT))
>
> then a spurious flat gets added instead of a spurious half-flat.  And
> if I set the half-flat to actually be a half-flat, the spurious
> accidentals still get added.  And even if I change the half-flat to be
> a full-flat, the spurious accidentals are still added.  So are you
> sure this is a bug to do with the sixth-tones?

You mean temporary accidentals. I don't remember, but it may have  
been some bugs. So some general model fixing such may be needed.

  Hans