From comments in:
http://lists.gnu.org/archive/html/
lilypond-devel/2015-06/msg00175.html
Added appropriate comments
in scm/font.scm and
mf/lilypond-fonts.conf.in
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
- <!-- Define LilyPond default fonts -->
+ <!--
+ Define LilyPond default fonts. Where a character doesn't exist in the
+ first font listed, the next font listed will be used instead for that
+ character. Also see scm/font.scm.
+ -->
<alias binding="strong">
<family>LilyPond Serif</family>
; "emmentaler", "sans-serif", and "monospace", respectively. All fonts are
; still accesible through the usual scheme symbols: 'feta, 'roman, 'sans, and
; 'typewriter.
+;
+; Note that 'LilyPond Serif', 'LilyPond Sans Serif' and 'Lilypond Monospace'
+; are aliases that are defined in mf/lilypond-fonts.conf.in (source file)
+; or fonts/lilypond-fonts.conf (installed file).
+
(define*-public (set-global-fonts #:key
(music "emmentaler")
(brace "emmentaler")