MNX (https://w3c.github.io/mnx/docs/), the successor of MusicXML, has reached a new milestone a few days ago: For the first time there exists a simple, rudimentary online viewer:
https://www.soundslice.com/mnx-viewer/ I suggest that interested people actively take part in the development of MNX so that a future conversion from and to LilyPond source code can be done as easily as possible, addressing the needs of LilyPond where necessary. Werner
