\version "2.19.80"
\header { tagline = ##f }

soprano = {
  c''4 ^\mf c''^> <c'' e'>^> c''
  c'' ^\< c'' c'' c'' \!
  c''^. c''^. ^\markup { \bracket { \dynamic mf } } c'' c''
}

alto = {
  e'4 ^\mf e'^> <g' c'>^> e'
  e' ^\< e' e' e' \!
  e'^. e'^. ^\markup { \bracket { \dynamic mf } } e' e'
}

thetext = \lyricmode {
  bla bla bla bla bla bla bla bla bla bla bla bla
}

\score {
  \new ChoirStaff <<
    \new Staff <<
      \clef treble
      \new Voice { \soprano }
      \addlyrics { \thetext }
    >>
    \new Staff <<
      \clef treble
      \new Voice { \alto }
      \addlyrics { \thetext }
    >>
  >>
  \layout { }
}

\score {
  \new PianoStaff <<
    \new Staff <<
      \clef treble
      \new Voice { \voiceOne \soprano }
      \new Voice { \voiceTwo \alto }
    >>
  >>
  \layout {
    \context {
      \Score
      \remove "Dynamic_engraver"
      \remove "Script_engraver"
      \remove "Text_engraver"
    }
    \context {
      \Staff
      \remove "Dynamic_engraver"
      \remove "Script_engraver"
      \remove "Text_engraver"
    }
    \context {
      \Voice
      \remove "Dynamic_engraver"
      \remove "Script_engraver"
      \remove "Text_engraver"
    }
  }
}