Re: NR 2.10.2 - arabic key signatures

[Federico Bruni]

Il giorno lun 4 lug 2016 alle 12:10, Carl Sorensen <address@hidden> 
ha scritto:
> On 7/1/16 5:08 AM, "Federico Bruni" <address@hidden> wrote:
>
> > Hi all
> >
> > In the following paragraph, taken from
> > http://lilypond.org/doc/v2.19/Documentation/notation/arabic-music#arabic-k
> > ey-signatures
> >
> > >  Other maqams in the same bayati group, as shown in the table below:
> > >  (bayati, hussaini, saba, and ushaq) can be indicated in the same 
> > > way.
> > >  These are all variations of the base and most common maqam in the
> > >  group, which is bayati. They usually differ from the base maqam in
> > >  their upper tetrachords, or certain flow details that don¹t change
> > >  their fundamental nature, as siblings.
> >
> > The last sentence seems quite obscure to me. What are "flow details"?
> > What are "siblings" in this context?
>
> I think that "flow details" and "siblings" are arabic music terms, 
> rather
> than LilyPond internal terms.

ok

> See https://en.wikipedia.org/wiki/Arabic_maqam
>
> Although, I can't really understand that wikipedia page either.  It
> appears that maqams are so different from traditional western music 
> that
> the terms are very difficult to relate.

In this page:
http://www.maqamworld.com/maqamat.html

it talks about "melodic flow":

> Another peculiarity of maqamat is that the same note is not always 
> played with the same exact pitch. The pitch may vary slightly, 
> depending on the __melodic flow__ and what other notes are played 
> before and after that note. The idea behind this effect is to round 
> sharp corners in the melody by drawing the furthest notes nearer. 
> This effect is sometimes called the law of attraction or gravity, and 
> is common in other musical traditions (e.g. in Byzantine music).

Perhaps the doc is implicitely about "melodic flow details"?
Then what would "siblings" mean in that context?