Re: Ornamentation in Bach's piece

[Hans Åberg]

> On 19 Sep 2021, at 14:44, 田村淳 <j.tamura@me.com> wrote:
> 
> Hello Lukas,
> 
>> 2021/09/19 21:14、Lukas-Fabian Moser <lfm@gmx.de>のメール:
>> 
>> Hi Jun,
>> 
>> Am 19.09.21 um 09:07 schrieb 田村淳:
>>> Is there a snipett to realize this?
>>> This is from the 3rd movement of the Sonata for Viola da Gamba and 
>>> Harpsichord in G-minor, BWV 1029, by J. S. Bach.
>>> 
>>> Thanks in advance for your kind help.
>>> 
>>> Jun
>>> 
>>> <ornamentation.jpg>
>> I think that's an instance of
>> 
>> https://gitlab.com/lilypond/lilypond/-/issues/6127
>> 
>> https://lsr.di.unimi.it/LSR/Item?u=1&id=720
>> 
>> https://gitlab.com/lilypond/lilypond/-/issues/503
>> 
>> Lukas
>> 
> Thank you. My question/request is identical to the issue #6127.
> 
> According to the Wikipedia article 
> https://en.wikipedia.org/wiki/Slide_(musical_ornament), the Schleifer can be 
> used for arbitrary interval while J. S. Bach seems to have used it for third 
> very often. I think that a solution with a fixed symbol for third would be 
> beneficial at least for those who have been typesetting Bach’s music often.

The Harvard Concise discusses it in the article on double appoggiatura, 
essentially a variation of two merged appoggiaturas a third apart. The symbol 
itself is called a direct, custos in Latin, in early manuscripts used at the 
end of staff to warn about the next note.