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---

Using mark lines in a Frenched score

Using MarkLine contexts (such as in “Placing rehearsal marks other than above the top staff”) in a Frenched score can be problematic if all the staves between two MarkLines are removed in one system. The Keep_alive_together_engraver can be used within each StaffGroup to keep the MarkLine alive only as long as the other staves in the group stay alive.

bars = {
  \tempo Allegro 4=120
  s1*2
  \*5 { \mark \default s1*2 }
  \bar "||"
  \tempo Adagio 4=40
  s1*2
  \*8 { \mark \default s1*2 }
  \bar "|."
}
winds = \*120 c''4
trumpet = {
  \*8 g'2
  R1*16
  \*4 g'2
  R1*8
}
trombone = {
  \*4 c'1
  R1*8
  d'1
  R1*17
}
strings = \*240 c''8

#(set-global-staff-size 16)
\paper {
  systems-per-page = 5
  ragged-last-bottom = ##f
  tagline = ##f
}

\layout {
  indent = 16\mm
  short-indent = 5\mm
  \context {
    \name MarkLine
    \type Engraver_group
    \consists Apply_output_engraver
    \consists Axis_group_engraver
    \consists Mark_engraver
    \consists Metronome_mark_engraver
    \consists Staff_collecting_engraver
    \override VerticalAxisGroup.remove-empty = ##t
    \override VerticalAxisGroup.remove-layer = #'any
    \override VerticalAxisGroup.staff-affinity = #DOWN
    \override VerticalAxisGroup.nonstaff-relatedstaff-spacing.padding = 1
    keepAliveInterfaces = #'()
  }
  \context {
    \Staff
    \override VerticalAxisGroup.remove-empty = ##t
    \override VerticalAxisGroup.remove-layer = ##f
  }
  \context {
    \StaffGroup
    \accepts MarkLine
    \consists Keep_alive_together_engraver
  }
  \context {
    \Score
    \remove Mark_engraver
    \remove Metronome_mark_engraver
    \remove Staff_collecting_engraver
    \override BarNumber.Y-offset = #3
  }
}

\score {
  <<
    \new StaffGroup = "winds" \with {
      instrumentName = "Winds"
      shortInstrumentName = "W."
    } <<
      \new MarkLine \bars
      \new Staff \winds
    >>
    \new StaffGroup = "brass" <<
      \new MarkLine \bars
      \new Staff = "trumpet" \with {
        instrumentName = "Trumpet"
        shortInstrumentName = "Tp."
      } \trumpet
      \new Staff = "trombone" \with {
        instrumentName = "Trombone"
        shortInstrumentName = "Tb."
      } \trombone
    >>
    \new StaffGroup = "strings" \with {
      instrumentName = "Strings"
      shortInstrumentName = "Str."
    } <<
      \new MarkLine \bars
      \new Staff = "strings" { \strings }
    >>
  >>
}