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Incipit

Dans le cadre de la transcription de musique mensurale, un « incipit » en début de pièce permet d’indiquer tonalité et tempo originaux. Si les musiciens sont aujourd’hui habitués aux barres de mesure qui mettent en évidence la structure rythmique, elles n’étaient pas courantes à l’époque – le mètre variait souvent après quelques notes. Dans une forme de compromis, les barres de mesures sont régulièrement imprimées entre les portées.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% A short excerpt from the Jubilate Deo by Orlande de Lassus
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\header { tagline = ##f }

global = {
  \set Score.skipBars = ##t
  \key g \major
  \time 4/4

  % the actual music
  \skip 1*8

  % let finis bar go through all staves
  \override Staff.BarLine.transparent = ##f

  % finis bar
  \bar "|."
}

discantusIncipit = {
  \clef "neomensural-c1"
  \key f \major
  \time 2/2
  c''1.
}

discantusNotes = {
  \transpose c' c'' {
    \clef "treble"
    d'2. d'4 |
    b e' d'2 |
    c'4 e'4.( d'8 c' b |
    a4) b a2 |
    b4.( c'8 d'4) c'4 |
    \once \hide NoteHead
    c'1 |
    b\breve |
  }
}

discantusLyrics = \lyricmode {
  Ju -- bi -- la -- te De -- o,
  om -- nis ter -- ra, __ om-
  "..."
  -us.
}

altusIncipit = {
  \clef "neomensural-c3"
  \key f \major
  \time 2/2
  r1 f'1.
}

altusNotes = {
  \transpose c' c'' {
    \clef "treble"
    r2 g2. e4 fis g |
    a2 g4 e |
    fis g4.( fis16 e fis4) |
    g1 |
    \once \hide NoteHead
    g1 |
    g\breve |
  }
}

altusLyrics = \lyricmode {
  Ju -- bi -- la -- te
  De -- o, om -- nis ter -- ra,
  "..."
  -us.
}

tenorIncipit = {
  \clef "neomensural-c4"
  \key f \major
  \time 2/2
  r\longa
  r\breve
  r1 c'1.
}

tenorNotes = {
  \transpose c' c' {
    \clef "treble_8"
    R1 |
    R1 |
    R1 |
    % two measures
    r2 d'2. d'4 b e' |
    \once \hide NoteHead
    e'1 |
    d'\breve |
  }
}

tenorLyrics = \lyricmode {
  Ju -- bi -- la -- te
  "..."
  -us.
}

bassusIncipit = {
  \clef "mensural-f"
  \key f \major
  \time 2/2
  r\maxima
  f1.
}

bassusNotes = {
  \transpose c' c' {
    \clef "bass"
    R1 |
    R1 |
    R1 |
    R1 |
    g2. e4 |
    \once \hide NoteHead
    e1 |
    g\breve |
  }
}

bassusLyrics = \lyricmode {
  Ju -- bi-
  "..."
  -us.
}

\score {
  <<
    \new StaffGroup = choirStaff <<
      \new Voice = "discantusNotes" <<
        \set Staff.instrumentName = "Discantus"
        \incipit \discantusIncipit
        \global
        \discantusNotes
      >>
      \new Lyrics \lyricsto discantusNotes { \discantusLyrics }
      \new Voice = "altusNotes" <<
        \set Staff.instrumentName = "Altus"
        \global
        \incipit \altusIncipit
        \altusNotes
      >>
      \new Lyrics \lyricsto altusNotes { \altusLyrics }
      \new Voice = "tenorNotes" <<
        \set Staff.instrumentName = "Tenor"
        \global
        \incipit \tenorIncipit
        \tenorNotes
      >>
      \new Lyrics \lyricsto tenorNotes { \tenorLyrics }
      \new Voice = "bassusNotes" <<
        \set Staff.instrumentName = "Bassus"
        \global
        \incipit \bassusIncipit
        \bassusNotes
      >>
      \new Lyrics \lyricsto bassusNotes { \bassusLyrics }
    >>
  >>
  \layout {
    \context {
      \Score
      %% no bar lines in staves or lyrics
      \hide BarLine
    }
    %% the next two instructions keep the lyrics between the bar lines
    \context {
      \Lyrics
      \consists "Bar_engraver"
      \consists "Separating_line_group_engraver"
    }
    \context {
      \Voice
      %% no slurs
      \hide Slur
      %% Comment in the below "\remove" command to allow line
      %% breaking also at those bar lines where a note overlaps
      %% into the next measure.  The command is commented out in this
      %% short example score, but especially for large scores, you
      %% will typically yield better line breaking and thus improve
      %% overall spacing if you comment in the following command.
      %%\remove "Forbid_line_break_engraver"
    }
    indent = 6\cm
    incipit-width = 4\cm
  }
}