Re: Polymetric music and page breaks

[Jan-Peter Voigt]

Dear Andrea,

right now I have to develop heavliy on something else ... so this is just a short intermission and might not be the help you are asking for ...

this is just, what I did, typesetting a polymetric song of my beloved uncle, where I also got into trouble with page/line breaking:

------------------------------------------------------------------------------snip--

% I declared a function for declaring 'count' measures of 'nom'/'den' timing

#(define-public taktdef (define-music-function (parser location nom den count)(integer? integer? integer?)
  (make-music
    'SequentialMusic
    'elements
    (list 
      (make-music
        'ContextSpeccedMusic
        'context-type
        'Timing
        'element
        (make-music
          'SequentialMusic
          'elements
          (list 
            
            (make-music
              'PropertySet
              'value
              (cons nom den)
              'symbol
              'timeSignatureFraction)
            (make-music
              'PropertySet
              'value
              (ly:make-moment 1 den 0 1)
              'symbol
              'beatLength)
            (make-music
              'PropertySet
              'value
              (ly:make-moment nom den 0 1)
              'symbol
              'measureLength))
      ))
      (make-music
        'SkipEvent
        'duration
        (ly:make-duration (inexact->exact (/ (log den)(log 2))) 0 (* nom count) 1))))))

% then I declared a music-function to build one staff with one voice and one lyrice line (it is a choral piece)

dostaff = #(define-music-function (parser location name short global meta noten vers)
  (string? string? ly:music? ly:music? ly:music? ly:music?)
  #{
    <<
      \new Staff \with {
        instrumentName = $name
        shortInstrumentName = $short
      } <<
        \new Voice { $meta }
        \new Voice = $name { $global $noten } >>
      \new Lyrics \lyricsto $name { $vers } >>
#})

% then I defined a meta, a notes and a lyrics var like this ... this doesn't fit!

global = {

% choral music!

\autoBeamOff

\dynamicUp

}

sopmeta = {

% ...

  \taktdef #7 #4 #1
  << \taktdef #11 #8 #1 { s4 \mark \default s \tempo "etwas bewegter" \bar "" } >>
  \taktdef #4 #4 #1

% ...
}

sopN = \relative c'' {

% ...
e | r4 r b4. b8 c! d! | b1. r4 |
% ...
}

sopT = \lyricmode {

a a a a

}

% ... alt,ten,bas

% and then I combined my parts like this

  \score {

    \new ChoirStaff <<

      \dostaff #"Sopran" #"S" { \global } \sopmeta \sopN \sopT

      \dostaff #"Alt" #"A" { \global } \altmeta \altN \altT

      \dostaff #"Tenor" #"T" { \clef "G_8" \global } \tenmeta \tenN \tenT

      \dostaff #"Bass" #"B" { \clef "bass" \global } \basmeta \basN \basT >>

}

------------------------------------------------------------------------------snip--

And this is a short test only with full measure rests:

It won't break, if you omit the empty bar lines. 

------------------------------------------------------------------------------snip--

\version "2.12.3" 

\layout {

#(layout-set-staff-size 12)

ragged-right = ##t

ragged-left = ##f

  \context {

    \Score

    \remove "Timing_translator"

    \remove "Default_bar_line_engraver"

\override NoteColumn #'ignore-collision = ##t

  }

  \context {

    \Staff

    \consists "Timing_translator"

    \consists "Default_bar_line_engraver"

  }

  \context {

\Voice

\remove "Forbid_line_break_engraver"

\override Beam #'breakable = ##t

  }

%end of layout

}

\score {

<<

\new Staff <<

{ \time 11/8 }

\repeat unfold 4 {

R8*11 \break

} >>

\new Staff <<

\time 13/8

\repeat unfold 3 {

R8*13

}

% if you omit this, no breaking will occur!

\repeat unfold 4 {

s8*11 \bar ""

} >> >>

}

------------------------------------------------------------------------------snip--

 As you can see in the first example, I used << \taktdef { s \bar "" s } >> for withinthemeasure breaks.

Regards,

Jan-Peter