If I understand you correctly, you could use "cond" as shown below, and use
your other arguments in place of "SYSTEM" or "STAFF".
HTH,
-Paul
\version "2.17.95"
foo = #(define-music-function( P L arg )
(string?)
(cond
((equal? arg "system")
#{
\mark \markup { "SYSTEM" }
#}
)
((equal? arg "staff")
#{
<>^"STAFF"
#}
)
(else
#{ #}
)))
% EXAMPLES
{ c \foo "system" c }
{ c \foo "staff" c }
{ c \foo "bar" c }
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