Hi all,
This is a very interesting discussion, I have been thinking of generating directives/instructions/scores (mostly in that order) for performers (definitely in the context of improvised music) but had not (yet?) got around to implementing anything. One thing that I did consider, though, was to use LilyPond to generate a .png file of a score snippet and place it in [insert your favorite gfx package here]. This would add a little bit of "latency" needed for LP to generate the thing (for small fragments it would probably be negligible) but to me it does not seem like a big issue because if I generate scores/instructions it is mainly for form consideration and not note-for-note exchange between the performer and the computer.
Just needed to get it off my chest :)
./MiS