Display the name of the staff of a note/rest/chord/skip-event

[Paolo Prete]

Hello, 

given a note/rest/chord/skip-event is there a way to display the name of its staff? I need to check if it belongs to staff "UP" or "DOWN" of a piano-staff.

What if I use map-some-music() function?

%%%%%%%%%%%%%%%%

      (map-some-music (lambda (evt) 

         (let ((name (ly:music-property evt 'name)))   

           (cond       

             ((or (eq? name 'NoteEvent )(eq? name 'EventChord) (eq? name 'RestEvent ) (eq? name 'SkipEvent ))                       

                

                %%%%%%%  (display ?????) %%%%%%%%%

                

                evt)

             (else #f)))) ; => #f = continue, go deeper 

      music) 

%%%%%%%%%%%%%%%%

Thanks.