This raise a great deal of questions but a lot of really exciting possibilities \o/
This is great!
Shouldn't the property be named ''modern musical notation'' to distinguish it from other forms of musical notations from around the world?
Regards,
Bodhisattwa
It shouldn't as Lilypond can be used for any musical notations
(at least in theory, not sure what is indeed implemented both on Lylipond and on Wikidata, I saw it used for medieval musical notation, on Wikisource IIRC)
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Cdlt, ~nicolas