\version "2.19.45"

global = {
  s1 \bar "||" \repeat volta 2 { s1 } s1 \bar "|."
}

one = {
  c'4 e' g' c'' |
  c'4 e' g' c'' |
  c'4 e' g' c'' |
}

two = {
  g4 c' e' g' |
  g4 c' e' g' |
  g4 c' e' g' |
}

music = {
  <<
    \new Staff << \global \one >>
    \new Staff << \global \two >>
  >>
}

\score {
  % Note that the repeat symbols (from \global) appear on all staffs.
  \music
}

\score {
  % Note that the music does not repeat.
  \unfoldRepeats \music
  \midi{}
}