@lilypond[verbatim,quote,relative=2]
c4 b
-\override NoteHead #'style = #'cross
+\override NoteHead.style = #'cross
c4 b
-\revert NoteHead #'style
+\revert NoteHead.style
a b
-\override NoteHead #'style = #'harmonic
+\override NoteHead.style = #'harmonic
a b
-\revert NoteHead #'style
+\revert NoteHead.style
c4 d e f
@end lilypond