\version "2.16.2"
\language "italiano"

altoVoice  = \relative do'' { r2 r4 la si( do) la4 la4 } 
altoTbn = \relative do ''{ do4 si4 la2 si la }
altoLyrics = \lyrics { Al -- le -- lu -- ia }

% Conducteur
\score {
  \new StaffGroup
  <<
    \new Staff 
    <<
      \new Voice = "Alto" \altoVoice
      \new Lyrics \lyricsto "Alto" \altoLyrics
      % \new Voice \altoTbn
    >>
    \new Staff
    <<
      \new Lyrics \lyricsto "Alto" \altoLyrics
      \new Voice \altoTbn
    >>
  >>
}
% Score du trombone seul
\score {
  \new Staff
  <<
    \new Devnull = "Alto" \altoVoice 
    \new Lyrics \lyricsto "Alto" \altoLyrics
    \new Voice \altoTbn
  >>
}