\version "2.19.16"

globalFonts = #(define-scheme-function (parser location name) (string?)
                 #{
                   \paper {
                     #(define fonts
                        (set-global-fonts
                         #:music name
                         #:brace name
                         #:factor (/ staff-height pt 20)
                         ))
                   }
                 #})