Re: Multiple repeat nested with alternative

[Mats Bengtsson]

I think some clarifications might be needed:

- LilyPond typesets the final alternative without a terminating vertical 
bar, except when the end of the alternative coincides with any of the 
following types of bar lines: ":|", "|:", "|.", ":|:", ":|.|:", ":|.:", 
".|".
 Can any of you who have proposed a new \finalalternative please 
provide a simple example showing when such a feature would be needed, 
just as Valentine requested.

- One way to obtain the desired layout using current Lilypond features, 
has already been proposed.
 An alternative solution is
\relative c'{
\repeat volta 2 { a a a a | b b b b | }
   \alternative{{c c c c | }{\bar ":|:" d d d d | }}
\repeat volta 2 {
   % Trick needed to fool LilyPond to not typeset the "|:" bar line:
   \once \set Timing.defaultBarType = "" \bar "|"
   e e e e | } \alternative {{f f f f }{g g g g }}
}
Unfortunately, this hack will not work nicely together with 
\unfoldRepeats or MIDI output, for obvious reasons.

     /Mats

Hans Aberg wrote:
> On 12 Mar 2009, at 09:49, Werner LEMBERG wrote:
>
> > > >                      ________     ________            ________    
> > > > ________
> > > >                     [1.      ]   [2.                 [1.      ]  [2.
> > > > | x x x x | x x x x | x x x x :||: x x x x | x x x x | x x x x :|| 
> > > > x x x
> > > > | x |
> > > >     A         B         C            D         E         F           G
> > > >
> > > > The correct order of performance/reading should be:
> > > > A B C A B D E F D E G
> > >
> > > Honestly, I would just scrap the repeats alltogether and write it
> > > all out.  As a person reading this, I would be very confused by what
> > > was meant.
> >
> > I strongly disagree.  This is standard notation since centuries; many
> > works by Mozart, Beethoven et al. use exactly this.
>
> Hindemith, "Elementary training...", p. 70, uses it. So it seems to be 
> standard. Note the subtlety that the last alternative is without a 
> terminating vertical bar, indicating a continuation.
>
> It might suffice to support a syntax like
>   \repeat volta 2 {A B}
>   \alternative {C}
>   \repeat volta 2 {D E}
>     \alternative {F}
>   G H I J ...
> That is, simply indicating one alternative less than in the "volta". 
> LilyPond could then infer that there should be another alternative 
> mark added in the following measure.
>
> Strictly speaking, this additional last alternative mark is redundant 
> from the semantic point of view: drop it and the music should be 
> played the same. (Though it may have to be there for traditional 
> reasons.)
>
>   Hans
>
>
>
>
> _______________________________________________
> bug-lilypond mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/bug-lilypond

--
=============================================
        Mats Bengtsson
        Signal Processing
        School of Electrical Engineering
        Royal Institute of Technology (KTH)
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================