Re: also, lyric help

[James E. Bailey]

El 14.02.2009, a las 17:35, Trevor Daniels escribió:

> James E. Bailey wrote Wednesday, February 11, 2009 11:38 AM
>
> > El 11.02.2009, a las 12:10, Trevor Daniels escribió:
>
> > > James E. Bailey wrote Wednesday, January 07, 2009 10:28 AM
> > > > Am 07.01.2009 um 11:06 schrieb Graham Percival:
> > > > > On Tue, Jan 06, 2009 at 10:18:02PM +0100, James E. Bailey wrote:
> > > > > > Thanks. I remember seeing that in the choral template, but I  
> > > > > > never
> > > > > > understood that contexts "die" after they're no longer in use.  
> > > > > > That
> > > > > > explains a lot.
> > > > > >
> > > > > > Can I request to the doc team that this be made a bit more    
> > > > > > explicit in
> > > > > > the documentation section on contexts?
> > > > >
> > > > > Yes and no.  If you say "could you make this a bit more clear",
> > > > > then we're going to get pissed off.  If you say "I think the docs
> > > > > would be more clear if you added a paragraph saying `blah blah
> > > > > foo' and deleted the sentence that says `to blah blah, you should
> > > > > bar'", then we'll love you forever.
> > > > Okay, then how about what Mats said, since I don't understand  
> > > > it  well enough to explain it any better.
> > > > "You may have to make sure that the same context survives.
> > > > If you do, say,
> > > > \new Staff { \new Voice = AAA {c d e f } \new Voice = BBB {g a b  
> > > > c }
> > > >   \context Voice = AAA { c1 }
> > > > }
> > > > the two "AAA" Voices will not be the same context, since the
> > > > first one dies after the f. Therefore, any lyrics associated with
> > > > the first measure will not continue to be associated with the
> > > > third measure."
> > >
> > > I finally got around to looking at this, but it turns out
> > > to be not as simple as it might seem.
> > >
> > > In Mats' example, voice AAA does *not*, in fact, die, but voice
> > > BBB does, as the following shows:
> > >
> > > \new Staff {
> > >  \new Voice = AAA {
> > >    \voiceOneStyle
> > >    c d e f
> > >  }
> > >  \new Voice = BBB {
> > >    \voiceTwoStyle
> > >    g a b c
> > >  }
> > >  \context Voice = AAA { c1 }
> > >  \context Voice = BBB { c1 }
> > >  \context Voice = AAA { c1 }
> > > }
> > >
> > > It seems that one voice context in a staff persists in
> > > this way, but the rest die as soon as they have
> > > nothing to do.  Clearly I can't use an example in the
> > > docs of a voice dying when in fact that example demonstrates
> > > the contrary!  It is easy enough to find an example which
> > > does demonstrate the death of contexts, but I have not yet found  
> > > a  way of predicting which voice will persist in all  
> > > circumstances.   I'll raise a discussion on this in -devel
> > > to see if this is intended, an accidental effect or a bug.
> > >
> > > In the meantime I'll document how to keep contexts alive.
> > >
> > > Trevor
> >
> > And, how could you keep voice BBB alive? Would that involve some  
> > polyphony with voice AAA and spacer rests?
>
> Yes.  You can either add spacer notes directly to the
> BBB voice as required to align the real notes correctly
> with AAA, or you can add a "keep-alive" block to the BBB
> context in parallel, like this:
>
> \new Staff {
>  <<
>    % keep voice AAA ...
>    \new Voice = AAA {
>      \voiceOneStyle
>      s1*5
>    }
>    % ... and voice BBB alive for 5 bars ...
>    \new Voice = BBB {
>      \voiceTwoStyle
>      s1*5
>    }
>    {
>      % ... in parallel with the real music
>      \context Voice = AAA { c4 d e f }
>      \context Voice = BBB { g4 a b c }
>      \context Voice = AAA { c1 }
>      \context Voice = BBB { c1 }
>      \context Voice = AAA { c1 }
>    }
>  >>
> }
>
> While in this example it is not strictly necessary
> keep voice AAA alive, keeping both (all) voices alive
> is a good habit to cultivate as the voice which persists
> by default is difficult to predict.
>
> Trevor

Of course I had to finish engraving a piece of music where I had to  
have 22 lyrics contexts because I couldn't figure a neat way of  
keeping the proper voice contexts alive in order to figure out a way  
to actually keep the voice contexts alive. It was far simpler than I  
thought.
\version "2.12.2"
dontDie = {
   <<
      \context Voice = AAA { s1*5}
      \context Voice = BBB { s1*5}
   >>
}
music = \transpose c c' {
   \context Voice = AAA {
      \voiceOneStyle
      c4 d e f
   }
   \context Voice = BBB {
      \voiceTwoStyle
      g a b c
   }
   \context Voice = AAA { c1 }
   \context Voice = BBB { c1 }
   \context Voice = AAA { c1 }
}

\score {
   \new Staff <<
      \dontDie
      \music
   >>
}