+ \[
+ \override NoteHead #'style = #'blackpetrucci
+ e'\longa^\markup { "LBB" }
+ f'\breve
+ \revert NoteHead #'style
+ e'
+ \]
+
+ \[
+ \override NoteHead #'style = #'blackpetrucci
+ b\breve^\markup { "BBBBBBL" }
+ g
+ \override NoteHead #'ligature-flexa = ##t
+ \override NoteHead #'flexa-width = #3
+ f
+ f'
+ \override NoteHead #'flexa-width = #5
+ b
+ c'
+ \revert NoteHead #'style
+ % though ligature-flexa is still ##t, this pair must be drawn as recta
+ b\longa
+ \revert NoteHead #'flexa-width
+ \revert NoteHead #'ligature-flexa
+ \]
+