\version "2.12.3"
<<
% Violinschlüssel Stimme 1
{
        \clef "violin" \key g \major \time 4/4 
        r4 d''^"Dux" b' fis' |
        g' c'' b' e'' |
        cis'' d''~ d'' cis'' |
        d'' b' a'4. g'8 |
        fis'4 b' g' c''~ |
        c'' b' a' d''~ | 
        d''
}
\\
% Violinschlüssel Stimme 2
{\clef "treble" \key g \major \time 4/4
  r1 |
  r |
  r |
  r4 \once \override NoteHead #'color = #red \once \override Stem #'color = #red g'_"Comes" 
  fis' cis' |
  d' g' \override NoteHead #'color = #red \override Stem #'color = #red e' a'
  fis' g'~ g' fis' |
  g' 
}

% Bassschlüssel
\new Staff{
        \clef "bass" \key g \major \time 4/4 s1 s s s s r2 r4 d'_"Dux" b 
}
>>