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Chords

Chord notation

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Adding a figured bass above or below the notes

When writing a figured bass, you can place the figures above or below the bass notes, by defining the BassFigureAlignmentPositioning.direction property (exclusively in a Staff context). Choices are #UP (or #1), #CENTER (or #0) and #DOWN (or #-1).

This property can be changed as many times as you wish. Use \once \override if you don’t want the override to apply to the whole score. 

bass = {
  \clef bass
  g4 b, c d
  e d8 c d2
}

continuo = \figuremode {
  <_>4 <6>4 <5/>4
  \override Staff.BassFigureAlignmentPositioning.direction = #UP
  %\bassFigureStaffAlignmentUp
  < _+ >4 <6>
  \set Staff.useBassFigureExtenders = ##t
  \override Staff.BassFigureAlignmentPositioning.direction = #DOWN
  %\bassFigureStaffAlignmentDown
  <4>4. <4>8 <_+>4
}

\score {
  <<
    \new Staff = bassStaff \bass
    \context Staff = bassStaff \continuo
  >>
}

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Aggiungere stanghette al contesto ChordNames

Per mostrare le stanghette nel contesto ChordNames, aggiungere l’incisore Bar_engraver. 

\new ChordNames \with {
  \override BarLine.bar-extent = #'(-2 . 2)
  \consists "Bar_engraver"
}

\chordmode {
  f1:maj7 f:7 bes:7
}

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Adjusting figured bass alteration glyphs

In figured bass, specially designed glyphs for 6\\, 7\\, and 9\\ are used by default. Similarly, specially designed glyphs for symbols 2\+, 4\+, and 5\+ are used by default if plus signs appear after the number.

To change that, pass an alist to figuredBassPlusStrokedAlist and set the glyph in question to #f (or omit it). 

\figures {
  \set figuredBassPlusDirection = #RIGHT
  <6\\> <7\\> <9\\> r
  <2\+> <4\+> <5\+> r

  \set figuredBassPlusStrokedAlist =
    #'((2 . "figbass.twoplus")
       ;; (4 . "figbass.fourplus")
       ;; (5 . "figbass.fiveplus")
       (6 . "figbass.sixstroked")
       ;; (7 . "figbass.sevenstroked")
       ;; (9 . "figbass.ninestroked")
      )
  <6\\> <7\\> <9\\> r
  <2\+> <4\+> <5\+> r
}

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Modifica del separatore dell’accordo

L’elemento che separa le diverse parti di un accordo può essere impostato su qualsiasi testo di tipo markup. 

\chords {
  c:7sus4
  \set chordNameSeparator
    = \markup { \typewriter | }
  c:7sus4
}

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Changing the chord names to German or semi-German notation

The english naming of chords (default) can be changed to german (\germanChords replaces B and Bes with H and B) or semi-german (\semiGermanChords replaces B and Bes with H and Bb). 

scm = \chordmode {
  c1/c | cis/cis
  b1/b | bis/bis | bes/bes
}


\layout {
  ragged-right = ##t
  \context {
    \ChordNames
    \consists "Instrument_name_engraver"
  }
}

<<
  \new ChordNames {
    \set instrumentName = #"default"
    \scm
  }
  \new ChordNames {
    \set instrumentName = #"german"
    \germanChords \scm
  }
  \new ChordNames {
    \set instrumentName = #"semi-german"
    \semiGermanChords \scm
  }
  \new ChordNames {
    \set instrumentName = #"italian"
    \italianChords \scm
  }
  \new ChordNames {
    \set instrumentName = #"french"
    \frenchChords \scm
  }
  \context Voice { \scm }
>>

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Cambiare la posizione delle alterazioni del basso continuo

Le alterazioni e i segni più possono apparire prima o dopo i numeri, a seconda delle proprietà figuredBassAlterationDirection e figuredBassPlusDirection. 

\figures {
  <5\+> <5+ 4\+> <6 4- 2\+> r
  \set figuredBassAlterationDirection = #RIGHT
  <5\+> <5+ 4\+> <6 4- 2\+> r
  \set figuredBassPlusDirection = #RIGHT
  <5\+> <5+ 4\+> <6 4- 2\+> r
  \set figuredBassAlterationDirection = #LEFT
  <5\+> <5+ 4\+> <6 4- 2\+> r
}

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Eccezioni dei nomi degli accordi

La proprietà chordNameExceptions permette di salvare un elenco di notazioni speciali per accordi specifici. 

% modify maj9 and 6(add9)
% Exception music is chords with markups
chExceptionMusic = {
  <c e g b d'>1-\markup { \super "maj9" }
  <c e g a d'>1-\markup { \super "6(add9)" }
}

% Convert music to list and prepend to existing exceptions.
chExceptions = #(append
  (sequential-music-to-chord-exceptions chExceptionMusic #t)
  ignatzekExceptions)

theMusic = \chordmode {
  g1:maj9 g1:6.9
  \set chordNameExceptions = #chExceptions
  g1:maj9 g1:6.9
}

\layout {
  ragged-right = ##t
}

<<
   \new ChordNames \theMusic
   \new Voice \theMusic
>>

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Nome dell’accordo di settima maggiore

La formattazione dell’accordo di settima maggiore può essere regolata con la proprietà majorSevenSymbol. 

\chords {
  c:7+
  \set majorSevenSymbol = \markup { j7 }
  c:7+
}

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Chord names alternative

Chord names are generated from a list of pitches. The functions which construct these names can be customised.

Here are shown chords following Ignatzek (pp. 17-18, 1995), used by default since LilyPond 1.7.20, compared with an alternative Jazz chord notation and Harald Banter’s (1987) notation. A smaller font is used in the latter case, as these tend to be overly verbose.

This mirrors the mechanism originally used in early LilyPond versions (pre-1.7); not having been properly maintained, however, some features have been lost (mainly chord exception lists) and bugs have been introduced. 

%%%% Legacy chord naming functions (formerly in scm/chord-generic-names.scm)
%%%% Copyright (C) 2003--2015 Jan Nieuwenhuizen <janneke@gnu.org>

#(set-global-staff-size 19.7)

#(define-public (banter-chordnames pitches bass inversion context)
  (old_chord->markup 'banter pitches bass inversion context))

#(define-public (jazz-chordnames pitches bass inversion context)
  (old_chord->markup 'jazz pitches bass inversion context))

#(define (define-translator-property symbol type? description)
  (if (not (and (symbol? symbol)
    (procedure? type?)
    (string? description)))
      (ly:error "error in call of define-translator-property"))
  (if (not (equal? (object-property symbol 'translation-doc) #f))
      (ly:error (G_ "symbol ~S redefined") symbol))

  (set-object-property! symbol 'translation-type? type?)
  (set-object-property! symbol 'translation-doc description)
  symbol)

#(for-each
  (lambda (x)
    (apply define-translator-property x))
  `((chordNameExceptionsFull ,list? "An alist of full chord
exceptions.  Contains @code{(@var{chord} . @var{markup})} entries.")
    (chordNameExceptionsPartial ,list? "An alist of partial chord
exceptions.  Contains @code{(@var{chord} . (@var{prefix-markup}
@var{suffix-markup}))} entries.")))

#(define-public (old_chord->markup
                style pitches bass inversion context)
  "Entry point for @code{Chord_name_engraver}.
@var{pitches}, @var{bass}, and @var{inversion} are lily pitches."
  (define (default-note-namer pitch)
    (note-name->markup pitch #f))

  (define (markup-or-empty-markup markup)
    "Return MARKUP if markup, else empty-markup"
    (if (markup? markup) markup empty-markup))

  (define (accidental->markup alteration)
    "Return accidental markup for ALTERATION."
    (if (= alteration 0)
        (make-line-markup (list empty-markup))
        (conditional-kern-before
         (alteration->text-accidental-markup alteration)
         (= alteration FLAT) 0.094725)))

  (define (list-minus a b)
    "Return list of elements in A that are not in B."
    (lset-difference eq? a b))

  (define (markup-join markups sep)
    "Return line-markup of MARKUPS, joining them with markup SEP"
    (if (pair? markups)
        (make-line-markup (list-insert-separator markups sep))
        empty-markup))

  (define (conditional-kern-before markup bool amount)
    "Add AMOUNT of space before MARKUP if BOOL is true."
    (if bool
        (make-line-markup
         (list (make-hspace-markup amount)
           markup))
        markup))

  (define (step-nr pitch)
    (let* ((pitch-nr (+ (* 7 (ly:pitch-octave pitch))
                        (ly:pitch-notename pitch)))
           (root-nr (+ (* 7 (ly:pitch-octave (car pitches)))
                       (ly:pitch-notename (car pitches)))))
      (+ 1 (- pitch-nr root-nr))))

  (define (next-third pitch)
    (ly:pitch-transpose pitch
                        (ly:make-pitch 0 2 (if (or (= (step-nr pitch) 3)
                                                   (= (step-nr pitch) 5))
                                               FLAT 0))))

  (define (step-alteration pitch)
    (let* ((diff (ly:pitch-diff (ly:make-pitch 0 0 0) (car pitches)))
           (normalized-pitch (ly:pitch-transpose pitch diff))
           (alteration (ly:pitch-alteration normalized-pitch)))
      (if (= (step-nr pitch) 7) (+ alteration SEMI-TONE) alteration)))

  (define (pitch-unalter pitch)
    (let ((alteration (step-alteration pitch)))
      (if (= alteration 0)
          pitch
          (ly:make-pitch (ly:pitch-octave pitch) (ly:pitch-notename pitch)
                         (- (ly:pitch-alteration pitch) alteration)))))

  (define (step-even-or-altered? pitch)
    (let ((nr (step-nr pitch)))
      (if (!= (modulo nr 2) 0)
          (!= (step-alteration pitch) 0)
          #t)))

  (define (step->markup-plusminus pitch)
    (let ((alt (step-alteration pitch)))
      (make-line-markup
       (list
        (number->string (step-nr pitch))
        (cond
         ((= alt DOUBLE-FLAT) "--")
         ((= alt FLAT) "-")
         ((= alt NATURAL) "")
         ((= alt SHARP) "+")
         ((= alt DOUBLE-SHARP) "++"))))))

  (define (step->markup-accidental pitch)
    (make-line-markup
     (list (accidental->markup (step-alteration pitch))
           (make-simple-markup (number->string (step-nr pitch))))))

  (define (step->markup-ignatzek pitch)
    (make-line-markup
     (if (and (= (step-nr pitch) 7)
              (= (step-alteration pitch) 1))
         (list (ly:context-property context 'majorSevenSymbol))
         (list (accidental->markup (step-alteration pitch))
               (make-simple-markup (number->string (step-nr pitch)))))))

  ;; tja, kennok
  (define (make-sub->markup step->markup)
    (lambda (pitch)
      (make-line-markup (list (make-simple-markup "no")
                              (step->markup pitch)))))

  (define (step-based-sub->markup step->markup pitch)
    (make-line-markup (list (make-simple-markup "no") (step->markup pitch))))

  (define (get-full-list pitch)
    (if (<= (step-nr pitch) (step-nr (last pitches)))
        (cons pitch (get-full-list (next-third pitch)))
        '()))

  (define (get-consecutive nr pitches)
    (if (pair? pitches)
        (let* ((pitch-nr (step-nr (car pitches)))
               (next-nr (if (!= (modulo pitch-nr 2) 0) (+ pitch-nr 2) nr)))
          (if (<= pitch-nr nr)
              (cons (car pitches) (get-consecutive next-nr (cdr pitches)))
              '()))
        '()))

  ;;; FIXME -- exceptions no longer work. -vv

  (define (full-match exceptions)
    (if (pair? exceptions)
        (let* ((e (car exceptions))
               (e-pitches (car e)))
          (if (equal? e-pitches pitches)
              e
              (full-match (cdr exceptions))))
        #f))

  (define (partial-match exceptions)
    (if (pair? exceptions)
        (let* ((e (car exceptions))
               (e-pitches (car e)))
          (if (equal? e-pitches (take pitches (length e-pitches)))
              e
              (partial-match (cdr exceptions))))
        #f))

  ;; FIXME: exceptions don’t work anyway.
  (if #f (begin
           (write-me "pitches: " pitches)))
  (let* ((full-exceptions
          (ly:context-property context 'chordNameExceptionsFull))
         (full-exception (full-match full-exceptions))
         (full-markup (if full-exception (cadr full-exception) '()))
         (partial-exceptions
          (ly:context-property context 'chordNameExceptionsPartial))
         (partial-exception (partial-match partial-exceptions))
         (partial-pitches (if partial-exception (car partial-exception) '()))
         (partial-markup-prefix
          (if partial-exception (markup-or-empty-markup
                                 (cadr partial-exception)) empty-markup))
         (partial-markup-suffix
          (if (and partial-exception (pair? (cddr partial-exception)))
              (markup-or-empty-markup (caddr partial-exception)) empty-markup))
         (root (car pitches))
         (full (get-full-list root))
         ;; kludge alert: replace partial matched lower part of all with
         ;; 'normal' pitches from full
         ;; (all pitches)
         (all (append (take full (length partial-pitches))
                      (drop pitches (length partial-pitches))))

         (highest (last all))
         (missing (list-minus full (map pitch-unalter all)))
         (consecutive (get-consecutive 1 all))
         (rest (list-minus all consecutive))
         (altered (filter step-even-or-altered? all))
         (cons-alt (filter step-even-or-altered? consecutive))
         (base (list-minus consecutive altered)))


    (if #f (begin
             (write-me "full:" full)
             ;; (write-me "partial-pitches:" partial-pitches)
             (write-me "full-markup:" full-markup)
             (write-me "partial-markup-perfix:" partial-markup-prefix)
             (write-me "partial-markup-suffix:" partial-markup-suffix)
             (write-me "all:" all)
             (write-me "altered:" altered)
             (write-me "missing:" missing)
             (write-me "consecutive:" consecutive)
             (write-me "rest:" rest)
             (write-me "base:" base)))

    (case style
      ((banter)
       ;;    root
       ;;    + steps:altered + (highest all -- if not altered)
       ;;    + subs:missing

       (let* ((root->markup default-note-namer)
              (step->markup step->markup-plusminus)
              (sub->markup (lambda (x)
                              (step-based-sub->markup step->markup x)))
              (sep (make-simple-markup "/")))

         (if
          (pair? full-markup)
          (make-line-markup (list (root->markup root) full-markup))

          (make-line-markup
           (list
            (root->markup root)
            partial-markup-prefix
            (make-super-markup
             (markup-join
              (append
               (map step->markup
                    (append altered
                            (if (and (> (step-nr highest) 5)
                                     (not
                                      (step-even-or-altered? highest)))
                                (list highest) '())))
               (list partial-markup-suffix)
               (map sub->markup missing))
              sep)))))))


      ((jazz)
       ;;    root
       ;;    + steps:(highest base) + cons-alt
       ;;    + 'add'
       ;;    + steps:rest
       (let* ((root->markup default-note-namer)
              (step->markup step->markup-ignatzek)
              (sep (make-simple-markup " "))
              (add-prefix (make-simple-markup " add")))

         (if
          (pair? full-markup)
          (make-line-markup (list (root->markup root) full-markup))

          (make-line-markup
           (list
            (root->markup root)
            partial-markup-prefix
            (make-super-markup
             (make-line-markup
              (list

               ;; kludge alert: omit <= 5
               ;;(markup-join (map step->markup
               ;;                        (cons (last base) cons-alt)) sep)

               ;; This fixes:
               ;;  c     C5       -> C
               ;;  c:2   C5 2     -> C2
               ;;  c:3-  Cm5      -> Cm
               ;;  c:6.9 C5 6add9 -> C6 add 9 (add?)
               ;;  ch = \chords { c c:2 c:3- c:6.9^7 }
               (markup-join (map step->markup
                                 (let ((tb (last base)))
                                   (if (> (step-nr tb) 5)
                                       (cons tb cons-alt)
                                       cons-alt))) sep)

               (if (pair? rest)
                   add-prefix
                   empty-markup)
               (markup-join (map step->markup rest) sep)
               partial-markup-suffix))))))))

      (else empty-markup))))


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%
%%%% Here begins the actual snippet:

chs = \transpose c' c' {
  <c e g>1
  <c es g>  % m = minor triad
  <c e gis>
  <c es ges> \break
  <c e g bes>
  <c es g bes>
  <c e g b>  % triangle = maj
  <c es ges beses>
  <c es ges b> \break
  <c e gis bes>
  <c es g b>
  <c e gis b>
  <c es ges bes> \break
  <c e g a>  % 6 = major triad with added sixth
  <c es g a>  % m6 = minor triad with added sixth
  <c e g bes d'>
  <c es g bes d'> \break
  <c es g bes d' f' a' >
  <c es g bes d' f' >
  <c es ges bes d' >
  <c e g bes des' > \break
  <c e g bes dis'>
  <c e g bes d' f'>
  <c e g bes d' fis'>
  <c e g bes d' f' a'> \break
  <c e g bes d' fis' as'>
  <c e gis bes dis'>
  <c e g bes dis' fis'>
  <c e g bes d' f' as'> \break
  <c e g bes des' f' as'>
  <c e g bes d' fis'>
  <c e g b d'>
  <c e g bes d' f' as'> \break
  <c e g bes des' f' as'>
  <c e g bes des' f' a'>
  <c e g b d'>
  <c e g b d' f' a'> \break
  <c e g b d' fis'>
  <c e g bes des' f ' a'>
  <c f g>
  <c f g bes> \break
  <c f g bes d'>
  <c e g d'>  % add9
  <c es g f'>
  <c e g b fis'>  % Lydian
  <c e g bes des' ees' fis' aes'>  % altered chord
}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% alternate Jazz notation

efullmusicJazzAlt = {
  <c e gis>1-\markup { "+" }
  <c e g b>-\markup {
    \normal-size-super
    % \override #'(font-family . math) "N"
    \override #'(font-family . math) "M"
  }
  %%c:3.5.7 = \markup { \override #'(font-family . math) "M" }
  %%c:3.5.7 = \markup { \normal-size-super "maj7" }

  <c es ges>-\markup { \super "o" }  % should be $\circ$ ?
  <c es ges bes>-\markup { \super \combine "o" "/" }
  <c es ges beses>-\markup { \super  "o7" }
}

efullJazzAlt = #(sequential-music-to-chord-exceptions efullmusicJazzAlt #f)

epartialmusicJazzAlt = {
  <c d>1-\markup { \normal-size-super "2" }
  <c es>-\markup { "m" }
  <c f>-\markup { \normal-size-super "sus4" }
  <c g>-\markup { \normal-size-super "5" }
  %% TODO, partial exceptions
  <c es f>-\markup { "m" }-\markup { \normal-size-super "sus4" }
  <c d es>-\markup { "m" }-\markup { \normal-size-super "sus2" }
}

epartialJazzAlt = #(sequential-music-to-chord-exceptions epartialmusicJazzAlt #f)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\score {
  <<
    \new ChordNames {
      %% Already set by default:
      %\set chordNameFunction = #ignatzek-chord-names
      \set instrumentName = "Ignatzek"
      \set shortInstrumentName = "Def"
      \chs
    }

    \new ChordNames {
      \set chordNameFunction = #jazz-chordnames
      \set majorSevenSymbol = \whiteTriangleMarkup
      \set chordNameSeparator = "/"
      \set chordNameExceptionsFull = \efullJazzAlt
      \set chordNameExceptionsPartial = \epartialJazzAlt
      \set instrumentName = "Alternative"
      \set shortInstrumentName = "Alt"
      \chs
    }

    %% This is the Banter (1987) style.  It gives exceedingly
    %% verbose (wide) names, making the output file take up to 4 pages.

    \new ChordNames {
      \set chordNameFunction = #banter-chordnames
      \override ChordName.font-size = #-3
      \set instrumentName = "Banter"
      \set shortInstrumentName = "Ban"
      \chs
    }

  \new Staff \transpose c c' { \chs }
  >>
  \layout {
    #(layout-set-staff-size 16)
    system-system-spacing.basic-distance = #0
    \context {
      \ChordNames
      \consists "Instrument_name_engraver"
    }
    \context {
      \Score
      \remove "Bar_number_engraver"
    }
  }
}

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Chords with stretched fingering for FretBoards and TabVoice

Sometimes chords with a stretched fingering are required. If not otherwise specified the context-property maximumFretStretch is set to 4, though. Resulting in a warning about "No string for pitch ..." and the note is omitted. You may set maximumFretStretch to an approppriate value or explecitely assign string-numbers to all notes of a chord. 

%% The code below will print two warnings, which may be omitted by uncommenting:
%#(for-each (lambda (x) (ly:expect-warning "No string for pitch")) (iota 2))

mus = {
  <c' bes'>
  <c'\2 bes'>
  \set maximumFretStretch = 5
  <c' bes'>
  <c'\2 bes'\1>
}

<<
  \new FretBoards \mus
  \new TabVoice \mus
>>

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Clusters

Clusters are a device to denote that a complete range of notes is to be played. 

fragment = \relative c' {
  c4 f <e d'>4
  <g a>8 <e a> a4 c2 <d b>4
  e2 c
}

<<
  \new Staff \fragment
  \new Staff \makeClusters \fragment
>>

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Controllare il posizionamento delle diteggiature di un accordo

Il posizionamento dei numeri della diteggiatura può essere regolato in modo preciso. Perché l’orientamento funzioni, occorre usare il costrutto per gli accordi <> anche per le note singole. Si può impostare in modo simile l’orientamento dei numeri di corda e delle diteggiature della mano destra. 

\relative c' {
  \set fingeringOrientations = #'(left)
  <c-1 e-3 a-5>4
  \set fingeringOrientations = #'(down)
  <c-1 e-3 a-5>4
  \set fingeringOrientations = #'(down right up)
  <c-1 e-3 a-5>4
  \set fingeringOrientations = #'(up)
  <c-1 e-3 a-5>4
  \set fingeringOrientations = #'(left)
  <c-1>2
  \set fingeringOrientations = #'(down)
  <e-3>2
  \set stringNumberOrientations = #'(up left down)
  <f\3 a\2 c\1>1
  \set strokeFingerOrientations = #'(down right up)
  <c\rightHandFinger #1 e\rightHandFinger #2 c'\rightHandFinger #4 >
}

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Cross-staff chords - beaming problems workaround

Sometimes it is better to use stems from the upper staff for creating cross-staff chords, because no problems with automatic beam collision avoidance then arise. If the stems from the lower staff were used in the following example, it would be necessary to change the automatic beam collision avoidance settings so that it doesn’t detect collisions between staves using \override Staff.Beam.collision-voice-only = ##t 

\new PianoStaff <<
  \new Staff = up
    \relative c' {
      <<
        { r4
          \override Stem.cross-staff = ##t
          \override Stem.length = #19 % this is in half-spaces,
              % so it makes stems 9.5 staffspaces long
          \override Stem.Y-offset = #-6 % stems are normally lengthened
              % upwards, so here we must lower the stem by the amount
              % equal to the lengthening - in this case (19 - 7) / 2
              % (7 is default stem length)
          e e e }
        { s4
          \change Staff = "bottom"
          \override NoteColumn.ignore-collision = ##t
          c, c c
        }
      >>
    }
  \new Staff = bottom
    \relative c' {
      \clef bass
      \voiceOne
      g8 a g a g a g a
    }
>>

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Customizing the chord grid style

Custom divisions of chord squares can be defined through the measure-division-lines-alist and measure-division-chord-placement-alist properties of ChordSquare. These are both alists. Their keys are measure divisions, namely lists which give the fraction of the measure that each chord (or rest, or skip) represents. More precisely, a measure division alist is made of positive, exact numbers adding up to 1, for example: '(1/2 1/4 1/4). The exactness requirement means that, e.g., 1/2 is valid but not 0.5.

The values in measure-division-lines-alist are lists of lines, which are represented as (x1 y1 x2 y2). The line starts at the point (x1 . y1) and ends at (x2 . y2). Coordinates are expressed in the [-1, 1] scale relative to the extent of the square.

The values in measure-division-chord-placement-alist are lists of (x . y) pairs giving the placement of the respective chords.

This example defines a peculiar chord grid style that has a rule for measures divided in three equal parts. 

\paper {
  line-width = 10\cm
  ragged-right = ##f
}

\new ChordGrid \with {
  \override ChordSquare.measure-division-lines-alist =
    #'(((1) . ())
       ((1/3 1/3 1/3) . ((-1 -0.4 0 1) (0 -1 1 0.4))))
  \override ChordSquare.measure-division-chord-placement-alist =
    #'(((1) . ((0 . 0)))
       ((1/3 1/3 1/3) . ((-0.7 . 0.5) (0 . 0) (0.7 . -0.5))))
}
\chordmode {
  \time 3/4
  c2.
  c4 c4 c4
}

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Customizing the no-chord symbol

By default, rests in a ChordNames context cause the “N.C.” symbol to be printed. This markup can be customized. 

<<
  \chords {
    R1
    \set noChordSymbol = "—"
    R1
    \set noChordSymbol = \markup \italic "Ssh!"
    R1
  }
  {
    R1*3
  }
>>

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Displaying complex chords

Here is a way to display a chord where the same note is played twice with different accidentals. 

fixA = {
  \once \override Stem.length = #11
}

fixB = {
  \once \override NoteHead.X-offset = #1.7
  \once \override Stem.length = #7
  \once \override Stem.rotation = #'(45 0 0)
  \once \override Stem.extra-offset = #'(-0.1 . -0.2)
  \once \override Flag.style = #'no-flag
  \once \override Accidental.extra-offset = #'(4 . -.1)
}


\relative c' {
  << { \fixA <b d!>8 } \\ { \voiceThree \fixB dis } >> s
}

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Manually break figured bass extenders for only some numbers

Figured bass often uses extenders to indicate continuation of the corresponding step. However, in this case lilypond is in greedy-mode and uses extenders whenever possible. To break individual extenders, one can simply use a modifier \! to a number, which breaks any extender attributed to that number right before the number. 

bassfigures = \figuremode {
  \set useBassFigureExtenders = ##t
  <6 4>4 <6 4\!> <6 4\!> <6 4\!> |  <6\! 4\!>  <6 4> <6 4\!> <6 4>
}

<<
  \new Staff \relative c'' { c1 c1 }
  \new FiguredBass \bassfigures
>>

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Print ChordNames with same root and different bass as slash and bass-note

To print subsequent ChordNames only differing in its bass note as slash and bass note use the here defined engraver. The behaviour may be controlled in detail by the chordChanges context property. 

#(define Bass_changes_equal_root_engraver
  (lambda (ctx)
  "For sequential @code{ChordNames} with same root, but different bass, the root
markup is dropped: D D/C D/B  -> D /C /B
The behaviour may be controlled by setting the @code{chordChanges}
context-property."
    (let ((chord-pitches '())
          (last-chord-pitches '())
          (bass-pitch #f))
      (make-engraver
        ((initialize this-engraver)
          (let ((chord-note-namer (ly:context-property ctx 'chordNoteNamer)))
            ;; Set 'chordNoteNamer, respect user setting if already done
            (ly:context-set-property! ctx 'chordNoteNamer
              (if (procedure? chord-note-namer)
                  chord-note-namer
                  note-name->markup))))
        (listeners
          ((note-event this-engraver event)
            (let* ((pitch (ly:event-property event 'pitch))
                   (pitch-name (ly:pitch-notename pitch))
                   (pitch-alt (ly:pitch-alteration pitch))
                   (bass (ly:event-property event 'bass #f))
                   (inversion (ly:event-property event 'inversion #f)))
            ;; Collect notes of the chord
            ;;  - to compare inversed chords we need to collect the bass note
            ;;    as usual member of the chord, whereas an added bass must be
            ;;    treated separate from the usual chord-notes
            ;;  - notes are stored as pairs containing their
            ;;    pitch-name (an integer), i.e. disregarding their octave and
            ;;    their alteration
            (cond (bass (set! bass-pitch pitch))
                  (inversion
                    (set! bass-pitch pitch)
                    (set! chord-pitches
                          (cons (cons pitch-name pitch-alt) chord-pitches)))
                  (else
                    (set! chord-pitches
                          (cons (cons pitch-name pitch-alt) chord-pitches)))))))
        (acknowledgers
          ((chord-name-interface this-engraver grob source-engraver)
            (let ((chord-changes (ly:context-property ctx 'chordChanges #f)))
              ;; If subsequent chords are equal apart from their bass,
              ;; reset the 'text-property.
              ;; Equality is done by comparing the sorted lists of this chord's
              ;; elements and the previous chord. Sorting is needed because
              ;; inverted chords may have a different order of pitches.
              ;; `chord-changes' needs to be true
              (if (and bass-pitch
                       chord-changes
                       (equal?
                         (sort chord-pitches car<)
                         (sort last-chord-pitches car<)))
                  (ly:grob-set-property! grob 'text
                    (make-line-markup
                      (list
                        (ly:context-property ctx 'slashChordSeparator)
                        ((ly:context-property ctx 'chordNoteNamer)
                         bass-pitch
                         (ly:context-property ctx 'chordNameLowercaseMinor))))))
              (set! last-chord-pitches chord-pitches)
              (set! chord-pitches '())
              (set! bass-pitch #f))))
        ((finalize this-engraver)
          (set! last-chord-pitches '()))))))

myChords = \chordmode {
  %\germanChords

  \set chordChanges = ##t
  d2:m d:m/cis

  d:m/c
  \set chordChanges = ##f
  d:m/b

  e1:7
  \set chordChanges = ##t
  e
  \break
  \once \set chordChanges = ##f
  e1/f
  e2/gis e/+gis e e:m/f d:m d:m/cis d:m/c
  \set chordChanges = ##f
  d:m/b
}

<<
  \new ChordNames
    \with { \consists #Bass_changes_equal_root_engraver }
    \myChords
  \new Staff \myChords
>>

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Mostrare gli accordi nei cambi

Per impostazione predefinita, ogni accordo inserito viene visualizzato; tale comportamento può essere modificato in modo che i nomi degli accordi siano mostrati solo all’inizio delle linee e quando l’accordo cambia. 

harmonies = \chordmode {
  c1:m c:m \break c:m c:m d
}

<<
  \new ChordNames {
    \set chordChanges = ##t
    \harmonies
  }
  \new Staff {
    \relative c' { \harmonies }
  }
>>

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Canzoniere semplice

Mettendo insieme nomi degli accordi, melodia e testo si ottiene un canzoniere (in inglese “lead sheet”): 

<<
  \chords { c2 g:sus4 f e }
  \new Staff \relative c'' {
    a4 e c8 e r4
    b2 c4( d)
  }
  \addlyrics { One day this shall be free __ }
>>

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Modello di rigo singolo con note, testo e accordi

Ecco il modello di un comune spartito semplificato (lead sheet): include linea melodica, testo vocale e sigle degli accordi. 

melody = \relative c' {
  \clef treble
  \key c \major
  \time 4/4

  a4 b c d
}

text = \lyricmode {
  Aaa Bee Cee Dee
}

harmonies = \chordmode {
  a2 c
}

\score {
  <<
    \new ChordNames {
      \set chordChanges = ##t
      \harmonies
    }
    \new Voice = "one" { \autoBeamOff \melody }
    \new Lyrics \lyricsto "one" \text
  >>
  \layout { }
  \midi { }
}

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Single staff template with notes, lyrics, chords and frets

Here is a simple lead sheet template with melody, lyrics, chords and fret diagrams. 

verseI = \lyricmode {
  \set stanza = #"1."
  This is the first verse
}

verseII = \lyricmode {
  \set stanza = #"2."
  This is the second verse.
}

theChords = \chordmode {
  % insert chords for chordnames and fretboards here
  c2 g4 c
}

staffMelody = \relative c' {
   \key c \major
   \clef treble
   % Type notes for melody here
   c4 d8 e f4 g
   \bar "|."
}

\score {
  <<
    \context ChordNames { \theChords }
    \context FretBoards { \theChords }
    \new Staff {
      \context Voice = "voiceMelody" { \staffMelody }
    }
    \new Lyrics = "lyricsI" {
      \lyricsto "voiceMelody" \verseI
    }
    \new Lyrics = "lyricsII" {
      \lyricsto "voiceMelody" \verseII
    }
  >>
  \layout { }
  \midi { }
}

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Modello di rigo singolo con note e accordi

Vuoi preparare uno spartito semplificato (lead sheet) con melodia e accordi? La tua ricerca è finita! 

melody = \relative c' {
  \clef treble
  \key c \major
  \time 4/4

  f4 e8[ c] d4 g
  a2 ~ a
}

harmonies = \chordmode {
  c4:m f:min7 g:maj c:aug
  d2:dim b4:5 e:sus
}

\score {
  <<
    \new ChordNames {
      \set chordChanges = ##t
      \harmonies
    }
    \new Staff \melody
  >>
  \layout{ }
  \midi { }
}

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Vertically centering paired figured bass extenders

Where figured bass extender lines are being used by setting useBassFigureExtenders to true, pairs of congruent figured bass extender lines are vertically centered if figuredBassCenterContinuations is set to true. 

<<
  \relative c' {
    c8 c b b a a c16 c b b
    c8 c b b a a c16 c b b
    c8 c b b a a c c b b
  }
  \figures {
    \set useBassFigureExtenders = ##t
    <6+ 4 3>4 <6 4 3>8 r
    <6+ 4 3>4 <6 4 3>8 <4 3+>16 r
    \set figuredBassCenterContinuations = ##t
    <6+ 4 3>4 <6 4 3>8 r
    <6+ 4 3>4 <6 4 3>8 <4 3+>16 r
    \set figuredBassCenterContinuations = ##f
    <6+ 4 3>4 <6 4 3>8 r
    <6+ 4 3>4 <6 4 3>8 <4 3+>8
  }
>>

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Volta sotto gli accordi

Aggiungendo l’incisore Volta_engraver al rigo, è possibile inserire le volte sotto gli accordi. 

\score {
  <<
    \chords {
      c1
      c1
    }
    \new Staff \with {
      \consists "Volta_engraver"
    }
    {
      \repeat volta 2 { c'1 }
      \alternative { c' }
    }
  >>
  \layout {
    \context {
      \Score
      \remove "Volta_engraver"
    }
  }
}

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LilyPond — Frammenti v2.24.4 (ramo stabile).