* https://en.wikisource.org/wiki/Page%3AA_Dictionary_of_Music_and_Musicians_vol_1.djvu/427
* Scroll down to the musical passage following :-"... traditional figure to which the first sentence is given out by the priest is " which has the line `\include "gregorian.ly"`
* View the page.
**What happens?**:
The musical scoring fails to render with `Unable to compile LilyPond input file`, indicating that `include` files are not currently supported in safe mode. ("line 1 - column 10:")
This is followed by other errors resulting from the lack of support for the additional commands.
**What should have happened instead?**:
The example should have rendered per the commands detailed in the lillypond documentation :-
http://lilypond.org/doc/v2.19/Documentation/notation/typesetting-gregorian-chant