Dear Brian, here you are:
\version "2.20.0" \paper { #(define fonts (set-global-fonts #:music "mtf-arnold" #:brace "emmentaler" #:roman "Futura" #:sans "sans-serif" #:typewriter "monospace" #:factor (/ staff-height pt 20) )) #(add-music-fonts fonts 'emmentaler "emmentaler" "emmentaler" feta-design-size-mapping (/ staff-height pt 20)) } { as \once \override Staff.Accidental.font-family = #'emmentaler \once \override NoteHead.font-family = #'emmentaler as! } %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% You need to define a name for the standard font ('emmentaler) and then you can use it on objects (here Accidentals and NoteHeads). Cheers, Joram