\score {
 
  \new StaffGroup
  <<
   \chords
	{ 
	\repeat volta 2  { a1:m/d  }
	 
	\alternative { { s } { s \break }
	}
	bes:m
	}
	
  \new Staff \with {
    instrumentName = #"Violino"
    midiInstrument = #"violin"
  }
  \new Voice = "violino" \relative c' {
   \key c \major
   \time 4/4
   \tempo 4=90
	      \repeat volta 2 { d1  }
 		\alternative {
  	      		{ a1 } { a1 } }	      	  
		f1
  }
  \new Staff \with {
    instrumentName = #"Viola"
    midiInstrument = #"flute"
  }
  \new Voice = "viola" \relative c '' {
   \key c \major
   \time 4/4
   \tempo 4=90
	      \repeat volta 2 { d1 }
 		\alternative {
  	      		{ f2 g } { f2 a }   }
		e1
  }
  >>
  \layout { }
  \midi { }
}