My only experience has been with AR Editions, and they wanted MusicXML or Finale/Sibelius format. They use Finale there.
I think probably the only way to use Lilypond would be to self-publish. The lack of MusicXML export in Lilypond is leading me to use MuseScore for more projects.
As the title implies: I've just converted a score from Finale, after the
composer had given up trying to get a readable layout. He's delighted
with the result, and seems interested in exploring LP. As he is also
considering publishing his piece, my question to the community is: which
publishers will accept submission in Lilypond format (or perhaps as
.PDF or .SVG) and do you have any recommendations or experiences?
Cheers,
Colin