\version "2.18.2"

myFirstIncipit = \markup \score {
  \new Staff {
    \clef "petrucci-c3"
    s8
  }
  \layout {
    line-width = 20
    \context {
      \Score
      \omit TimeSignature
    }
  }
}

mySecondIncipit = \markup\column {
  \score {
    \new Staff {
      \clef "petrucci-c4"
      s8
    }
    \layout {
      line-width = 20
      \context {
        \Score
        \omit TimeSignature
      }
    }
  }
  \vspace #.4
}

myThirdIncipit = \markup \score {
  \new Staff {
    \clef "mensural-f"
    s8
  }
  \layout {
    line-width = 20
    \context {
      \Score
      \omit TimeSignature
    }
  }
}