\version "2.7.3"

global = {
  \override Score.RemoveEmptyVerticalGroup #'remove-first = ##t
  s1
  \set Score . repeatCommands = #'((volta "1."))
  s1
  \set Score . repeatCommands = #'((volta #f)) \bar "|."
  s1
  \bar "||" \break
  \set Score . repeatCommands = #'((volta "2."))
  s1
  \set Score . repeatCommands = #'((volta #f))
  s1
  \bar "|."
}

\score {
  \new StaffGroup <<
    \new Staff <<
      \global
      { R1*3 \repeat unfold 2 g'1 }
    >>
    \new Staff <<
      \global
      \repeat unfold 5 e'1
    >>
    \new Staff <<
      \global
      \repeat unfold 5 c'1
    >>
  >>
  \layout {
    raggedright  = ##t
    \context { \RemoveEmptyStaffContext }
  }
}