this:
@quotation
-@mudela[fragment,verbatim]
+@lilypond[fragment,verbatim]
\relative c'' { \key c \minor; r8 c16 b c8 g as c16 b c8 d | g,4 }
-@end mudela
+@end lilypond
@end quotation
The output looks very good: the font and the layout algorithms were