\version "2.18.2"

\header {
  title = "How to add Bar Numbers?"
  composer = "address@hidden"
}

global = {
  \key c \major
  \time 4/4
}

%%%%%%%%%%%%%%%%%
scoreAViolinI = \relative c'  {
  \global
  c4 d e f
  g a b a
  g f e d
  \bar "||"
  c d e f
  g a b a
  g f e d
  \bar "||"
  c d e f
  g a b a
  g f e d
  \bar "||"
  c d e f
  g a b a
  g f e d
  \bar "||"
}

scoreAViolinII = \relative c'  {
  \global
  c4 d e f
  g a b a
  g f e d
  \bar "||"
  c d e f
  g a b a
  g f e d
  \bar "||"
  c d e f
  g a b a
  g f e d
  \bar "||"
  c d e f
  g a b a
  g f e d
  \bar "||"
}


%%%%%%%%%%%%%%%%%
scoreACelloI = \relative c' {
  \global
  c4 b a g
  f e d c
  b c d e 
  f g a  b
  \bar "||"
  c4 b a g
  f e d c
  b c d e 
  f g a  b
  \bar "||"
  c4 b a g
  f e d c
  b c d e 
  f g a  b
  \bar "||"
}

scoreACelloII = \relative c' {
  \global
  c4 b a g
  f e d c
  b c d e 
  f g a  b
  \bar "||"
  c4 b a g
  f e d c
  b c d e 
  f g a  b
  \bar "||"
  c4 b a g
  f e d c
  b c d e 
  f g a  b
  \bar "||"
}


scoreAViolinIPart = \new Staff \with {
  instrumentName = "Violin I"
  midiInstrument = "violin"
} \scoreAViolinI

scoreAViolinIIPart = \new Staff \with {
  instrumentName = "Violin II"
  midiInstrument = "violin"
} \scoreAViolinII


scoreACelloIPart = \new Staff \with {
  instrumentName = "Cello I"
  midiInstrument = "Cello"
} { \clef bass \scoreACelloI }

scoreACelloIIPart = \new Staff \with {
  instrumentName = "Cello II"
  midiInstrument = "Cello"
} { \clef bass \scoreACelloII }


\score {
  <<
    \new StaffGroup <<
    \scoreAViolinIPart
    \scoreAViolinIIPart
    >>
    \new StaffGroup <<
    \scoreACelloIPart
    \scoreACelloIIPart
    >>
  >>
  \layout { 
    \context {
      \Score
      \remove "Timing_translator"
      \remove "Default_bar_line_engraver"
    }
    \context {
      \Staff
      \consists "Timing_translator"
      \consists "Default_bar_line_engraver"
    }
  }
  \midi {
    \tempo 4=100
  }
}