>>> For a piano score I want to include a chord that has two notes
>>> like the c and the c-sharp. Tried <c! cis>, but lilypond puts
>>> both the natural and the sharp sign before the chord. [...]
>
> If you need this frequently, you may be interested in the attached
> code and pdf (your example is first).
This is very nice, thanks! Looking at the examples I noticed that the
'melting point' seems to depend on the stem length: if there are
beams, the melting point has a larger distance to the note heads than
without. Is there a reason for this? In Gould's examples ('Behind
Bars', p. 51), the distance to the note heads is fixed, regardless of
a beam; see attached image.
Werner