#153782 lilypond: Grace notes and volta bar merges

Package:
lilypond
Source:
lilypond
Description:
program for typesetting sheet music
Submitter:
Daniel Burrows
Date:
2015-04-28 18:54:05 UTC
Severity:
minor
#153782#5
Date:
2002-07-21 20:44:58 UTC
From:
To:
  (also sent to bug-lilypond@gnu.org, to make sure they see this)

  The following lilypond fragment will produce a bit of music which
incorrectly has two visible repeat bars.  Running it through lilypond is
probably the best way to see what I mean.  The "a" grace note is visible
between the two repeat bars.
---------------------------------------------------------------------------
\score {
  \context PianoStaff \notes <
    \context Staff=top \context Voice=top \notes \relative c' {
      \repeat volta 2 {
        \grace {d16}
        c4 d e f
      }

      \grace {a16} g8 f e d c2
    }
    \context Staff=bottom \context Voice=bottom \notes \relative c {
      \clef bass
      \repeat volta 2 {
      c4 <e-. g> c <e-. g> }|
      g g, c <e-. g>
    } >
}
---------------------------------------------------------------------------

  However (and this is the interesting part), if you remove "\grace {a16}"
from the above score or use a standard (non-piano) staff, correct output
is produced.  (well, I also seem to be getting an extra bass clef that
overlaps the time signature, but that's not related)

  Daniel
#153782#10
Date:
2007-04-21 03:41:23 UTC
From:
To:
The 2.8-compatible version of Daniels's excerpt is:

==CUT==
\version "2.7.40"
\score {
  \context PianoStaff  <<
    \context Staff = "top" \context Voice = "top"  \relative c' {
      \repeat volta 2 {
        \grace { d16 }
         c4 d e f
      }
      \grace { a16 } g8 f e d c2
    }
    \context Staff = "bottom" \context Voice = "bottom"  \relative c {
      \clef bass
      \repeat volta 2 {
      c4 <e g>-. c <e g>-. }|
      g g, c <e g>-.
    } >>
}
==CUT==

The problem still occurs in 2.8.7-3. There was no response on
bug-lilypond@gnu.org to Daniel's bug forwarding. [0]


Regards,

/Lamby

[0] http://osdir.com/ml/gnu.lilypond.bugs/2002-07/threads.html#00099
#153782#15
Date:
2011-06-07 14:57:38 UTC
From:
To:
This bug is caused by a failure to maintain appropriate grace music in
parallel staves at the start of a special music block.

The solution is to add a \grace {s16} at the beginning of the repeat in the
bottom staff.

This is now documented in the notation reference.

Thanks,

Carl Sorensen
#153782#26
Date:
2013-04-24 06:13:57 UTC
From:
To:
Here's the link to the relevant part in the documentation for current
stable:
http://lilypond.org/doc/v2.16/Documentation/notation/special-rhythmic-concerns#index-grace_002dnote-synchronization

This bug is already recorded on the lilypond tracker:
https://code.google.com/p/lilypond/issues/detail?id=34