Die Gedanken sind frei/score

\version "2.19.82"
\language "deutsch"
#(define myTitel "Die Gedanken sind frei")

mypoet = \markup {
  \override #'(baseline-skip . 3)
  \left-column {
    #notensatz
  }
}

mycomposer = \markup {
  \override #'(baseline-skip . 3)
  \right-column {
    "T: Volkslied, Ende 18. Jhdt."
    "Volksweise, Schlesien u. Hessen, um 1815"
  }
}

songchords =
\chordmode {
  s4 c2. c g:7 c c c g:7 c g c g
  c f c g c2
}

kopf= \header {
  title = \markup \line
  {
    #myTitel
  }
  subtitle = ##f
  subsubtitle = ##f
  poet = #mypoet
  composer = #mycomposer
}

\bookpart {
  \paper {
    score-markup-spacing.basic-distance = 1
    system-system-spacing.basic-distance = 15
    system-system-spacing.padding = 8
    top-markup-spacing.basic-distance = 15
    top-system-spacing.basic-distance = 25
    bottom-margin = 10
  }
  \include "_index.ly"
  \kopf
  \score
  {
    <<
      \new StaffGroup
      \with
      {
        \override VerticalAxisGroup.staff-staff-spacing.basic-distance = 16
        %\override VerticalAxisGroup.nonstaff-nonstaff-spacing.basic-distance = 8
        %\override VerticalAxisGroup.nonstaff-nonstaff-spacing.padding = 18
      }
      <<
        \new ChordNames \songchords
        <<
          \new BarNumberStaff=melodie
          \with
          {
            instrumentName = \markup \center-column { S A }
            shortInstrumentName = \markup \center-column { S A }
            \override VerticalAxisGroup.nonstaff-nonstaff-spacing.padding = 18
          }
          {
            <<
              \new Voice=melody { \voiceOne \sop }
              \new Lyrics \with
              {
                \override VerticalAxisGroup.staff-affinity = #DOWN
                \override VerticalAxisGroup.nonstaff-nonstaff-spacing.padding = 4
              }
              \lyricsto "melody" \firstverse
              %\new Lyrics \lyricsto "melody" \secverse
              %\new Lyrics \lyricsto "melody" \triverse
              \new Voice { \voiceTwo \alt }
            >>
          }
          \new Staff=unten \with
          {
            instrumentName = \markup \center-column { T B }
            shortInstrumentName = \markup \center-column { T B }
          }
          {
            <<
              \new Voice=vten { \voiceOne \ten }
              \new Lyrics \lyricsto "vten" \tenverse
              \new Lyrics \with { alignAboveContext = unten } \lyricsto "vten" \tenoverse
              \new Voice=vbass { \voiceTwo \bas }
              \new Lyrics \lyricsto "vbass" \basverse
            >>
          }
        >>
      >>
    >>
  }
  %\markup \vspace #10
  \strophen
}