3.3.4 Creating footnotes
Footnotes may be used in many different situations. In all cases,
a ‘footnote mark’ is placed as a reference in text or music, and
the corresponding ‘footnote text’ appears at the bottom of the
same page, separated from the music by a horizontal line.
The appearance of this separator can be changed by setting the paper
variable footnote-separator-markup, see
\paper variables concerning headers and markups.
Footnotes within music expressions and footnotes in stand-alone text
outside music expressions are created in different ways.