+Guitar chord charts often show the strumming rhythms. This can
+be done with the @code{Pitch_squash_engraver} and
+@code{\improvisationOn}.
+
+
+@lilypond[quote,verbatim]
+<<
+ \new ChordNames {
+ \chordmode {
+ c1 f g c
+ }
+ }
+
+ \new Voice \with {
+ \consists Pitch_squash_engraver
+ } \relative c'' {
+ \improvisationOn
+ c4 c8 c c4 c8 c
+ f4 f8 f f4 f8 f
+ g4 g8 g g4 g8 g
+ c4 c8 c c4 c8 c
+ }
+>>
+@end lilypond
+
+@predefined
+@code{\improvisationOn},
+@code{\improvisationOff}.
+
+@snippets
+@c TODO -- Convert to snippet;
+@c tag for both Rhythms and Guitar? Move to @seealso?
+
+For guitar music, it is possible to show strum rhythms, along
+with melody notes, chord names, and fret diagrams.
+
+
+@lilypond[quote,verbatim]
+\include "predefined-guitar-fretboards.ly"
+<<
+ \new ChordNames {
+ \chordmode {
+ c1 f g c
+ }
+ }
+
+ \new FretBoards {
+ \chordmode {
+ c1 f g c
+ }
+ }
+
+
+ \new Voice \with {
+ \consists Pitch_squash_engraver
+ } \relative c'' {
+ \improvisationOn
+ c4 c8 c c4 c8 c
+ f4 f8 f f4 f8 f
+ g4 g8 g g4 g8 g
+ c4 c8 c c4 c8 c
+ }
+
+
+ \new Voice = "melody" {
+ \relative c'' {
+ \improvisationOff
+ c2 e4 e4
+ f2. r4
+ g2. a4
+ e4 c2.
+ }
+ }
+
+ \new Lyrics {
+ \lyricsto "melody" {
+ This is my song.
+ I like to sing.
+ }
+ }
+>>
+@end lilypond
+
+@seealso
+
+Snippets:
+@rlsr{Rhythms}.
+
+Internals Reference:
+@rinternals{RhythmicStaff},
+@rinternals{Pitch_squash_engraver}.