Bonjour Aiki,
1er essai :
%%
\version "2.19.82"
musique = \fixed c' { c d e f g a b c' \bar "|." }
\new GrandStaff \with { \omit SpanBar } <<
\new Staff \with { instrumentName = "Sop. I" } << \new Voice \musique >>
\new Staff \with { instrumentName = "Sop. II" } << \new Voice \musique >>
\new Staff \with { instrumentName = "Alto" } << \new Voice \musique >>
\new Staff \with { instrumentName = "Tenor" } << \new Voice \clef "G_8" \musique >>
\new Staff \with { instrumentName = "Basse" } << \new Voice \clef "bass" \musique >>
>>
%%
Cordialement,
Pierre