Blanking staff lines using the \whiteout command
The \whiteout
command underlays a markup with a white
box. Since staff lines are in a lower layer than most other grobs,
this white box will not overlap any other grob.
\layout { ragged-right = ##f } \relative c' { \override TextScript.extra-offset = #'(2 . 4) c2-\markup { \whiteout \pad-markup #0.5 "middle C" } c }