Referring to https://lilypond.org/doc/v2.22/Documentation/notation/substitution-function-syntax
I don't understand this sentence explanating "...music...": >normal LilyPond input, using $ (in places where only LilyPond constructs are allowed) or # (to use it as a Scheme value or music function argument or music inside of music >lists) to reference arguments (eg. ‘#arg1’). The next section in the docs with examples has no example of use of '$'. When should I use $? Thanks, Kees
