\version "2.18.0"

\include "gregorian.ly"

\score {
  <<
    \new VaticanaVoice = "cantus"
    {
      \clef "vaticana-do3"
      d
      \[ d \pes e \]
      d
      \finalis
    }
    \new Lyrics
    \lyricsto "cantus"
    {
    Re -- bla -- bla.
    }
  >>
}