Improvisation is sometimes denoted with slashed note heads. Such note
heads can be created by adding a @internalsref{Pitch_squash_engraver}
-to the @internalsref{Staff} or @internalsref{Voice} context. Then, the
+to the @internalsref{Voice} context. Then, the
following command
@example
the following example
@lilypond[verbatim,ragged-right,quote]
-\new Staff \with {
+\new Voice \with {
\consists Pitch_squash_engraver
} \transpose c c' {
e8 e g a a16(bes)(a8) g \improvisationOn