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Two \partCombine pairs on one staff: Difference between revisions

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The <code>\partCombine</code> function takes two music expressions each containing a part, and distributes them among four <code>Voice</code>s named “two”, “one”, “solo”, and “chords” depending on when and how the parts are merged into a common voice. The voices output from <code>\partCombine</code> can have their layout properties adjusted in the usual way. Here we define extensions of <code>\partCombine</code> to make it easier to put four voices on a staff.
The <code>\partCombine</code> function takes two music expressions, each containing a part, and distributes them among four <code>Voice</code> contexts named “one”, “two”, “solo”, and “shared”, depending on when and how the parts are merged into a common voice.


<pre>soprano = { d'4 | cis'  b  e'  d'8 cis' | cis'2 b }
Variants of <code>\partCombine</code> are <code>\partCombineUp</code> and <code>\partCombineDown</code> to produce up-stem and down-stem merging of two voices, respectively.  Combining them to squeeze four parts into a single staff, however, need some special setup, which this snippet defines accordingly.
 
<lilypond version="2.24">
customPartCombineUp =
#(define-music-function (part1 part2) (ly:music? ly:music?)
  "Make an up-stem `VoiceBox` context that combines PART1 and PART2.
 
The context is called 'Up'; internally, the function calls
`\\partCombineUp`."
  #{
    \new VoiceBox = "Up" <<
      \context Voice = "one" { \voiceOne }
      \context Voice = "two" { \voiceThree }
      \context Voice = "shared" { \voiceOne }
      \context Voice = "solo" { \voiceOne }
      \context NullVoice = "null" {}
      \partCombine #part1 #part2
    >>
  #})
 
customPartCombineDown =
#(define-music-function (part3 part4) (ly:music? ly:music?)
  "Make a down-stem `VoiceBox` context that combines PART3 and PART4.
 
The context is called 'Down'; internally, the function calls
`\\partCombineDown`."
  #{
    \new VoiceBox = "Down" <<
      \set VoiceBox.soloText = #"Solo III"
      \set VoiceBox.soloIIText = #"Solo IV"
      \context Voice ="one" { \voiceFour }
      \context Voice ="two" { \voiceTwo }
      \context Voice ="shared" { \voiceFour }
      \context Voice ="solo" { \voiceFour }
      \context NullVoice = "null" {}
      \partCombine #part3 #part4
    >>
  #})
 
soprano = { d'4 | cis'  b  e'  d'8 cis' | cis'2 b }
alto = { fis4 | e8 fis gis ais b4 b | b ais fis2 }
alto = { fis4 | e8 fis gis ais b4 b | b ais fis2 }
tenor = { a8 b | cis' dis' e'4 b8 cis' d'4 | gis cis' dis'2 }
tenor = { a8 b | cis' dis' e'4 b8 cis' d'4 | gis cis' dis'2 }
bass = { fis8 gis | a4 gis g fis | eis fis b,2 }
bass = { fis8 gis | a4 gis g fis | eis fis b,2 }


\new Staff &lt;&lt;
\new Staff <<
   \key b\minor  
   \key b\minor
   \clef alto
   \clef alto
   \partial 4
   \partial 4
   \transpose b b'
   \transpose b b' \customPartCombineUp \soprano \alto
  \partCombineUp \soprano \alto
   \customPartCombineDown \tenor \bass
   \partCombineDown \tenor \bass
>>
&gt;&gt;</pre>


<lilypond version="2.24">
\layout {
\layout {
   \context {
   \context {
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   }
   }
}
}
customPartCombineUp =
#(define-music-function (partOne partTwo)
  (ly:music? ly:music?)
"Take the music in @var{partOne} and @var{partTwo} and return
a @code{VoiceBox} named @q{Up} containing @code{Voice}s
that contain @var{partOne} and @var{partTwo} merged into one
voice where feasible.  This variant sets the default voicing
in the output to use upward stems."
#{
  \new VoiceBox = "Up" <<
    \context Voice = "one" { \voiceOne }
    \context Voice = "two" { \voiceThree }
    \context Voice = "shared" { \voiceOne }
    \context Voice = "solo" { \voiceOne }
    \context NullVoice = "null" {}
    \partCombine #partOne #partTwo
  >>
#})
customPartCombineDown = #
(define-music-function (partOne partTwo)
  (ly:music? ly:music?)
"Take the music in @var{partOne} and @var{partTwo} and return
a @code{VoiceBox} named @q{Down} containing @code{Voice}s
that contain @var{partOne} and @var{partTwo} merged into one
voice where feasible.  This variant sets the default voicing
in the output to use downward stems."
#{
  \new VoiceBox = "Down" <<
    \set VoiceBox.soloText = #"Solo III"
    \set VoiceBox.soloIIText = #"Solo IV"
    \context Voice ="one" { \voiceFour }
    \context Voice ="two" { \voiceTwo }
    \context Voice ="shared" { \voiceFour }
    \context Voice ="solo" { \voiceFour }
    \context NullVoice = "null" {}
    \partCombine #partOne #partTwo
  >>
#})
soprano = { d'4 | cis'  b  e'  d'8 cis' | cis'2 b }
alto = { fis4 | e8 fis gis ais b4 b | b ais fis2 }
tenor = { a8 b | cis' dis' e'4 b8 cis' d'4 | gis cis' dis'2 }
bass = { fis8 gis | a4 gis g fis | eis fis b,2 }
\new Staff <<
  \key b\minor
  \clef alto
  \partial 4
  \transpose b b'
  \customPartCombineUp \soprano \alto
  \customPartCombineDown \tenor \bass
>>
</lilypond>
</lilypond>


[[Category:Scheme]]
[[Category:Simultaneous notes]]
[[Category:Simultaneous notes]]
[[Category:Staff notation]]
[[Category:Staff notation]]
[[Category:Included in the official documentation]]
[[Category:Included in the official documentation]]
[[Category:Snippet]]
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