Re: How to make jazz-like leadsheets without melody, only chords, and text?

[Aaron Hill]

On 2021-03-24 1:07 am, Jacques Menu wrote:
> This works, but with a second, empty staff:
>
> \version "2.20.0"
>
> \language "english"
> \include "lilyjazz.ily"
>
> global = {  \time 4/4   \key f \major  \tempo 4=100}
> chordNames = \chordmode {f1:7 f:7 f:7 f:7}
>
> \score {
>   <<
>     \global
>
>     \new ChordNames {
>       \chordNames
>     }
>
>     \new Voice
>     \with { \consists "Pitch_squash_engraver" }
>     {
>       \improvisationOn \omit Stem
>       \repeat unfold 16 { 4 }
>     }
>   >>
> }

You need to be more explicit about creating staves and voices.  Also, 
you will want to remove the Note_performer so that the dummy slash notes 
do not interfere with MIDI:

%%%%
\version "2.22.0"

global = { \time 4/4 \key f \major \tempo 4=100 }
chordNames = \chordmode { f1:maj7 e:7 a:m bes/c }

\score {
  <<
    \new ChordNames \chordNames
    \new Staff <<
      \new NullVoice \global
      \new Voice
        \with { \consists "Pitch_squash_engraver"
                \remove "Note_performer" }
      {
        \improvisationOn \omit Stem
        \repeat unfold 16 { c4 }
      }
    >>
  >>
  \layout {}
  \midi {}
}
%%%%

And while we're at it... why not make the slashes automatically fit the 
chord music?

%%%%
\version "2.22.0"

slashesForMusic =
#(define-music-function
  (slash-duration reference-music)
  (ly:duration? ly:music?)
  #{ \new Voice
     \with { \consists "Pitch_squash_engraver"
             \remove "Note_performer" }
     { \improvisationOn \omit Stem
       \repeat unfold
       #(ly:moment-main (ly:moment-div
         (ly:music-length reference-music)
         (ly:duration-length slash-duration)))
       { c $slash-duration } } #})

global = { \time 4/4 \key f \major \tempo 4=100 }
chordNames = \chordmode { f1:maj7 e:7 a:m bes/c }

\score {
  <<
    \new ChordNames \chordNames
    \new Staff <<
      \new NullVoice \global
      \slashesForMusic 4 \chordNames
    >>
  >>
  \layout {}
  \midi {}
}
%%%%


-- Aaron Hill