source: https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/key-alter/
MusicXML 4.0 >
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key-alter
Parent element:
<key>
Non-traditional key signatures are represented using a list of altered tones. The element represents the alteration for a given pitch step, represented with semitones in the same manner as the element. The different element names indicate the different meaning of altering notes in a scale versus altering a sounding pitch.
semitones
None.
This element is used in the following examples:
, (Non-Traditional)