Re: Migrating from commercial music notation software to free alternative

[ah]

Thank you people for the very useful insight and the links.

First, to clarify that by Tex-like I meant programmatically, either 
(La)TeX macros or Scheme plus data.

It looks the task must involve Sibelius at all costs. So migrating is 
not going to happen. However I am warm on the idea of creating a 
Sibelius plugin to call LilyPond if licencing problems can be resolved,
do some rendering that Sibelius possibly can't and get back the result.