I thought lilypond was a somewhat lower level abstraction, like the score tool they talk about?
It would definitely be cool to export, but import sounds inherently lossy if what I said above is true.
I don't understand why, as an entrenched user of LilyPond, you'd want to use MuseScore either direction. LilyPond has been such a perfect tool for me that I can create better-looking scores with it faster than anything else; a GUI would just get in the way.
Collaboration would be one reason. I have quite some friends that use MuseScore and are orders of magnitude better musicians than I am, but I could help them create better looking scores and nicer rehearsal tracks if they could just export to Lilypond to give me something to start from.
Does MusicXML not function well as an interchange format for you?
is that problem even solvable ? lilypond's language is turing-complete, no ?
Hey, dreaming is free! At the very least it could output lilypond files that you could tweak by hand.
lilypond does have MusicXML import/export converters, and MusicXML is also supported by MuseScore.
Last time I checked, I could find no MusicXML exporter that supported the latest syntax.