**Feature summary**: Use the mensural notation features in Score extension (Lilypond)
**Use case(s)**:
I was trying to transcribe some public-domain music from the 17th century on Wikisource, and I found that [[ https://lilypond.org/doc/v2.22/Documentation/notation/typesetting-gregorian-chant | Lilypond has the functionality to transcribe it]], but only if I put
```
\include "gregorian.ly"
```
in a Lilypond file. Including the file is not possible in Mediawiki; obviously it would be //highly// undesirable for editors to be able to include arbitrary files in Lilypond rendering, security for Lilypond seems to be hard enough as it is.
Is there a reasonable alternative way to allow Mediawiki scores to use the historic notation marks usually enabled by "gregorian.ly"?
**Benefits**: This particular functionality would be useful, especially on Wikisource. Unsurprisingly, a lot of public-domain music scores are written in historic notation forms. Historic notation often can't be translated one-for-one to modern notation. For instance, some of it does not indicate absolute pitch/note name at all, some has durations that are flexible in specific ways, some can be played several different ways, and the pieces I am transcribing have finalis marks, section markers with a set of meanings that overlap with several different modern notations (there are also some historic notations of un- or poorly-known meaning). This is why musicians performing, say, Gregorian chant, usually use Gregorian notation ([[ https://www.catholiceducation.org/en/culture/music/an-idiot-s-guide-to-square-notes.html | example ]]). It is possible to write a modern interpretation of the piece in modern notation, but not the historic score.