Re: tie over clef change

[Hans Åberg]

> On 27 Sep 2020, at 20:20, David Kastrup <dak@gnu.org> wrote:
> 
> Hans Åberg <haberg-1@telia.com> writes:
> 
>>> On 27 Sep 2020, at 19:31, David Kastrup <dak@gnu.org> wrote:
>>> 
>>> Hans Åberg <haberg-1@telia.com> writes:
>>> 
>>>>> On 26 Sep 2020, at 18:04, Dan Eble <dan@faithful.be> wrote:
>>>>> 
>>>>>> On Sep 26, 2020, at 09:41, Dan Eble <dan@faithful.be> wrote:
>>>>>> 
>>>>>> On Sep 26, 2020, at 08:55, Werner LEMBERG <wl@gnu.org> wrote:
>>>>>>> 
>>>>>>> 
>>>>>>> Despite Gould's “incorrect” verdict, here is an example from an old UE
>>>>>>> edition of Liszt's “Liebestraum No. 1”, which demonstrates that ties
>>>>>>> over clef changes *do* happen and make sense sometimes...
>>>>>>> 
>>>>>>> I still think that LilyPond should support that, handling the tie like
>>>>>>> a slur in this case.
>>>>>> 
>>>>>> That's a very good example.  It's hard to imagine any reasonable 
>>>>>> alternative.
>>>>>> 
>>>>>> What kind of grob would an editor expect here? a Tie because it
>>>>>> connects notes of the same pitch, or a Slur because it connects
>>>>>> notes at different staff positions? (or something else?)
>>>>> 
>>>>> I'll answer my own question.  A tie from d♯ to e♭ generates a Tie
>>>>> grob, so for consistency, this should be a Tie that looks like a
>>>>> slur.
>>>> 
>>>> The notes d♯ to e♭ have different pitches in the staff notation
>>>> system, which cannot express E12 enharmonic equivalents, so this is
>>>> slur. So it should be a slur that looks like slur.
>>> 
>>> We are talking about a piano here.  It has no different keys for d♯ and
>>> e♭ and only a single manual.  A slur even across the same pitch will be
>>> executed with a separate keypress as opposed to a tie.
>> 
>> If you look down the thread, there are two different questions, when
>> expressing it in the staff notation as is, and when forcing E12
>> enharmonic equivalents onto it.
>> 
>> And not all pianos are tuned in E12, as in the case of meantone
>> tunings.
> 
> I repeat: It has no different keys for d♯ and e♭ and only a single
> manual.  Yes, I know about historical split-key instruments but that is
> not what a modern piano composer is writing for.

Both cases were discussed. For an orchestra they are not the same pitch, thus 
formally a slur.