PDF author metadata

[Federico Bruni]

Hi all

I'd like to edit this page of the documentation:
http://lilypond.org/doc/v2.19/Documentation/notation/creating-pdf-metadata.html

to add what I learned here:
https://lists.gnu.org/archive/html/bug-lilypond/2016-07/msg00008.html

I have another question on this subject.
Who should be in your opinion the author of a LilyPond score PDF? The 
composer or the typesetter?
Of course the answer depends on the use case.
In my opinion having the composer (or arranger) as author is more 
useful, because you can filter the scores in your hard disk by author 
metadata if you use a document management software (such as Gnome 
Documents in Linux).

Do you think that it's worth adding a paragraph about it in the 
documentation? i.e. recomend using pdfauthor along with composer in the 
\header block.

The advantage of an application such as Gnome Documents is that you can 
quickly access a PDF score without having to browse through folders in 
the file manager.