\version "2.18.2"  % necessary for upgrading to future LilyPond versions.

\paper{ make-footer=##f }

\header {
   title = "Petit exemple"
   composer = "moi-même"
}

\score { 

<<
\new Staff \with { instrumentName = "Soprano" midiInstrument = "voice oohs" } \relative c'' {
  \clef G
  \key c \major
  \tempo 4 = 60
  \time 2/4
  c4 r
  d ( b )
  c2 \bar "|."
}

\new Staff \with { instrumentName = "Alto" midiInstrument = "choir aahs" }  \relative c' {
  \clef G
  \key c \major
  r4 c (
  g' d )
  c2
}

>>

\layout {}
\midi {}

}