Re: GrandStaff vertical distance

[foxfanfare]

Lukas-Fabian Moser wrote
> I disagree that LP does not follow the standard engraving rules. It just 
> seems to me that \new GrandStaff etc. imply a certain semantics which is 
> perfectly alright for, e.g., an orchestral Piano part, but just does not 
> apply for the braces connecting Violin 1 and 2. - I do not own Gould's 
> book, but I would expect that this is discussed there.

I have her book. About the curly braces, she says: "The curly bracket, also
called a brace, connects the staves of instruments that use two staves: most
commonly keyboard and harp. [...] The brace may connect two or more staves
of like instruments (or like voices), but this is a traditional style now
rarely used in orchestral music: it is more effective visually - and
space-saving - to reserve it for joining the staves of a single instrument"

The brace used for a single instrument should be written with PianoStaff. I
see absolutely no reason of using the GrandStaff for that purpose! Or could
someone explain me why two functions would do exactly the same thing?

The GrandStaff connector should be reserved as a secondary demarcation (it
is by the way how it is presented in the documentation and examples!) and
that is why I think the default behaviour is wrong in this case (or the
documentation misleading).

I think it is the same with "square bracket" which should only apply to
secondary demarcation. In the documentation
(http://lilypond.org/doc/v2.19/Documentation/notation/displaying-staves#nested-staff-groups),
the "square bracket" is used in the second example as a primary demarcation.
I looked in different scores and cannot find this kind kind of use anywhere!

I may be wrong, but in my opinion, that is what I would expect for the
default behaviour of staff grouping:
- PianoStaff for a single instrument, with a centered instrument name label
(if needed, a staff label could be added). This group takes spaces on top
and below itself.
- StaffGroup for grouping different instruments in a same section with a
main bracket. This group takes spaces on top and below itself.
- GrandStaff (or something else) for secondary grouping. Like the function
you have produced and which allow the user to choose whatever he wants as a
secundary demaraction, but without adding any spaces.



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