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1.2.2 LilyPond variables
LilyPond variables are stored internally in the form of Scheme variables. Thus,
twelve = 12
is equivalent to
#(define twelve 12)
This means that LilyPond variables are available for use in Scheme expressions. For example, we could use
twentyFour = #(* 2 twelve)
which would result in the number 24 being stored in the
LilyPond (and Scheme) variable twentyFour.
The usual way to refer to Lilypond variables, LilyPond Scheme syntax, is to call them using a backslash, i.e., \twentyFour.
Since this creates a copy of the value for most of LilyPond’s internal
types, in particular music expressions, music functions don’t usually
create copies of material they change. For this reason, music
expressions given with # should usually not contain material that
is not either created from scratch or explicitly copied rather than
directly referenced.
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