\version "2.7.3"

\layout { 
  raggedright  = ##t 
  \context { 
    \Score
    \remove "Repeat_acknowledge_engraver"
  }
  \context { 
    \Staff
    \consists "Repeat_acknowledge_engraver"
  }
}

global = {
  \tag #'(violino bass) {
    s1
    \tag #'violino \set Staff . repeatCommands = #'((volta "1."))
    s1
    \tag #'violino \set Staff . repeatCommands = #'((volta #f)) \bar "|."
    s1
    \bar "||" \break
  }
  \tag #'flauti \set Staff . repeatCommands = #'((volta "2."))
  s1
  \tag #'flauti \set Staff . repeatCommands = #'((volta #f))
  s1
  \bar "|."
}

\score {
  \new StaffGroup <<
    { 
      \skip 1*3
      \new Staff <<
        \set Staff.alignAboveContext = #"violino"
        \keepWithTag #'flauti \global
        \repeat unfold 2 g'1
      >>
    }
    \context Staff = "violino" <<
      \keepWithTag #'violino \global
      \repeat unfold 5 e'1
    >>
    \new Staff <<
      \keepWithTag #'bass \global
      \repeat unfold 5 c'1
    >>
  >>
}