I found 2 mistakes (typos, but rather serious - wrong notes!) in
Mutopia's version of Beethoven's Pathetique Piano Sonata (1st movement).
My problem is that a .ly file syntax is old (from 1.6 I think) and
convert-ly cannot convert it to the latest stable version of LilyPond.
Now, I can fix the typos in an old .ly file, but I cannot make and send
fixed .ps/.pdf files to Mutopia. Is there any common practice of keeping
up-to-date and bugfixing tons of Mutopia works among LilyPond developers?