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Historical key signatures #1144

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@craigsapp

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Are these two key signatures possible in the new key-signature implementation (or have they previously already been possible)?

(1) Moving the accidental to a non-modern position on the clef:

Screen Shot 2019-09-15 at 3 43 21 PM

(2) Doubling the pitch class at the octave:

Screen Shot 2019-09-15 at 3 44 29 PM

Both are common in mensural music, where the accidental in the key signature refers to a specific pitch and not to a pitch class. Related to this, I can imagine that this key signature will be useful:

Screen Shot 2019-09-15 at 3 53 44 PM

which means that the B2 pitches should be flatted, but the B3 pitches should not be flatted.

A somewhat related key signature:

Screen Shot 2019-09-15 at 3 53 48 PM

which is related to 17th-century key signatures: the modern key signature would add one more flat (and remove more written accidentals) than the convention of the time. For example E-flat major would be notated with one flat rather than the modern convention of two.


It would also be useful to have a semantic/logical attribute on key signatures (and/or <keyAccid>) for historical purposes to indicate whether or not the accidentals apply to pitch classes (treated as the default behavior), or to specific pitches (such as @absolute="true").

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