[MEI-L] "Cancelling" key signatures; non-standard key sigs

[Andrew Hankinson]

So, I think there are a few solutions here:

1) Add “n” to the regex for @key.sig and allow key signatures with naturals. May be the easiest and most straightforward solution.
2) Add “n” to @key.sig.mixed and specify that when working with cancelled key signatures to use key.sig.mixed. Seems like an overloaded use of this, though.
3) Punt it down the line to renderers, and not worry about it. The evidence seems to suggest, however, that naturals are present in sources, so will be an issue in encoding.

So, I’d like to propose that “n” should be added to the datatype for both @key.sig and @key.sig.mixed. That way a key signature composed of all or partial natural signs can be encoded in the source.

-Andrew

On Sep 5, 2014, at 10:17 AM, Andrew Hankinson <andrew.hankinson at mail.mcgill.ca> wrote:

> Well, there's a @key.sig.mixed, but that only validates s/f:
> 
> "[a-g][0-9](\- {1,3}|f{1,3}|#{1,3}|s{1,3}|x)" }+
> 
> "It is intended that key.sig.mixed contain a series of tokens with each token containing pitch name, accidental, and octave, such as 'A4 Cs5 Ef5' that indicate what key accidentals should be rendered and where they should be placed."
> 
> 
> On Sep 5, 2014, at 9:46 AM, Byrd, Donald A. <donbyrd at indiana.edu> wrote:
> 
>> I assume MEI can represent non-standard key signatures? E.g., Bartok's Mikrokosmos has key sigs with accidentals in nonstandard positions and with mixed sharps and flats.
>> 
>> --DAB
>> 
>> 
>> On Fri, 5 Sep 2014 08:40:39 +0200, Laurent Pugin <laurent at music.mcgill.ca> wrote:
>> 
>>>> It?s really only the absence of any key signature (Cmaj/Amin) where an
>>>> explicit change with naturals would be needed to clarify that the key
>>>> signature has changed.
>>> 
>>> In that case I think what you want to encode is the key change (and
>>> not the key signature). What about a /scoreDef with a @key.mode and
>>> @key.pname ?
>>> 
>>> Laurent
>>> 
>>>> 
>>>> -Andrew
>>>> 
>>>> On Sep 4, 2014, at 5:21 PM, Laurent Pugin <lxpugin at gmail.com> wrote:
>>>> 
>>>> Hi Andrew,
>>>> 
>>>> I would expect this to be done at the rendering. For example, naturals would
>>>> be added when changing from 4s to 1s. But maybe I am overlooking something.
>>>> 
>>>> In any case, I am not sure your regexp would do the job since you would
>>>> probably need to have both s or f together with n. For example 3n1s for the
>>>> aforementioned case.
>>>> 
>>>> Laurent
>>>> 
>>>> On Sep 4, 2014 10:29 PM, "Andrew Hankinson" <andrew.hankinson at gmail.com>
>>>> wrote:
>>>>> 
>>>>> Hi all,
>>>>> 
>>>>> The data.KEYSIGNATURE regex specifies the following valid values:
>>>>> "mixed|0|[1-7][f|s]?.
>>>>> 
>>>>> However, naturals may also appear in a key signature to clarify cancelling
>>>>> a key signature; for example, if you were to go from Gmaj to Cmaj, you may
>>>>> wish to write a natural in the key signature to indicate the new key.
>>>>> 
>>>>> Perhaps the regex should be amended to: "mixed|0|[1-7][f|s|n]??
>>>>> 
>>>>> Or is there another suggestion?
>>>>> 
>>>>> Cheers,
>>>>> -Andrew
>>>>> 
>>>>> 
>>>>> 
>>>>> 
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>> 
>> 
>> --
>> Donald Byrd
>> Woodrow Wilson Indiana Teaching Fellow
>> Adjunct Associate Professor of Informatics
>> Visiting Scientist, Research Technologies
>> Indiana University Bloomington
>> 
>> 
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