imslp wrote:Now that got me thinking: do we really need to allow MUS/SIB files? PDF seems to be doing fine,
You are right, as long as every possible score you need is available. However, if there is e.g. only the full score available and you need the individual parts for a performance, you are totally out of luck with PDFs, while you can extract the individual parts (or otherwise edit) from the MUS/SIB scores... I had this exact problem a year or so ago with my choir and a score over at CPDL. I was so glad that the author provided the source file, otherwise we couldn't have performed that piece easily.
So, whereever possible, I'm all for archiving the source files, too.
I would say:
-) Every score SHOULD be available as PDF
-) Additional source files (.mus, .sib, MusicXML, etc) for re-typesets are encouraged, as long as a PDF is provided, too.