> oo = #(define-music-function (parser location prop value)
>        (symbol-list? scheme?)
>         #{ \once \override #prop = #value #})
> 
> should likely work fine in 2.18.

Thanks!  Aaron provided this version

  oo = #(define-music-function (parser location prop value)
         (list? scheme?)
          #{ \once \override $prop = #value #})

and I wonder which one is better...


    Werer

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