I resend my patch that will do the right thing when just writing
<< g,4 d'4 b'4 g'2>>
A couple of comments:
If I were to typeset this chord, my first choice would be to tweak the
duration-log of some of the note-heads within a normal chord, see for
example
http://lists.gnu.org/archive/html/lilypond-user/2010-10/msg00188.html.
Agreed, this is an ugly syntax that requires a good understanding of the
LilyPond internals, even though the technique explicitly is mentioned in
the section on Tweak, in the Notation Reference. This could be an answer
to Grahams question on how to implement the feature internally in LilyPond.
We shouldn't blame Bach! If you look at his autograph, you will see that
he uses separate stems for the different notes. This has been very
thoroughly imitated in the edition prepared by late Werner Icking, see
for example the first bars of
http://icking-music-archive.org/scores/bach/sonatas_and_partitas/bwv1001.pdf
(typeset using MusiXTeX), in case you don't have access to a good copy
of the autograph and think that
http://upload.wikimedia.org/wikipedia/commons/a/a5/BWV1001.jpg is too
small. However, there are many other composers that use the notation you
are discussing (in addition to lots of editions of Bach).
/Mats
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