different fonts in composer name

[Christian]

I am trying to use 2 different fonts for the composter name.
But lilypond doesn't show it the way I would like it to.


  composer = \markup \override #'(font-name . "Plantin MT Std Italic") {
Muziek: }  %\markup \override #'(font-name . "Plantin MT Std") { John Goss
(1800 - 1880) }