+@seealso
+
+Music Glossary:
+@rglos{chord}.
+
+Notation Reference:
+@ref{Chorded notes},
+@ref{Input modes}.
+
+Snippets:
+@rlsr{Chords}
+
+@node Common chords
+@unnumberedsubsubsec Common chords
+
+@cindex triads
+@cindex seventh chords
+@cindex root of chord
+@cindex modifiers, in chords.
+@cindex chord quality
+
+Major triads are entered by including the root and an
+optional duration:
+
+@lilypond[verbatim,quote,relative=1,ragged-right]
+\chordmode { c2 f4 g }
+@end lilypond
+
+Minor, augmented, and diminished triads are entered by placing
+@code{:} and a quality modifier string after the duration:
+
+@lilypond[verbatim,quote,ragged-right,relative=1]
+\chordmode { c2:m f4:aug g:dim }
+@end lilypond
+
+Seventh chords may be created:
+
+@lilypond[quote,ragged-right,fragment,verbatim,relative=1]
+\chordmode {
+ c1:7 c:m7 c:maj7 c:dim7 c:aug7
+}
+@end lilypond
+
+@funindex aug
+@funindex dim
+@funindex maj
+@funindex m
+
+The table belows shows the actions of the quality modifiers on
+triads and seventh chords.
+
+@table @code
+
+@item m
+The minor chord. This modifier lowers the 3rd and (if present) the
+7th step.
+
+@item dim
+The diminished chord. This modifier lowers the 3rd, 5th and (if
+present) the 7th step.
+
+@item aug
+The augmented chord. This modifier raises the 5th step.
+
+@item maj
+The major 7th chord. This modifier adds a raised 7th step. The
+@code{7} following @code{maj} is optional. Do NOT use this modifier
+to create a major triad.
+
+@end table
+
+@c TODO -- perhaps add warning about c and c:maj being different, while
+@c c:maj and c:maj7 are the same
+
+@seealso
+
+Snippets:
+@rlsr{Chords}
+
+@node Extended and altered chords
+@unnumberedsubsubsec Extended and altered chords
+
+@cindex extended chords
+@cindex altered chords
+
+Chord structures of arbitrary complexity can be created in chord
+mode. The modifier string can be used to extend a chord, add or
+remove chord steps, raise or lower chord steps, and add a bass note
+or create an inversion.
+
+The first number following the @code{:} is taken to be the extent
+of the chord. The chord is constructed by sequentially adding
+thirds to the root until the specified number has been reached.
+If the extent is not a third (e.g., 6), thirds are added up to the
+highest third below the extent, and then the step of the extent is
+added. The largest possible value for the extent is 13. Any
+larger value is interpreted as 13.
+
+@lilypond[quote,ragged-right,fragment,verbatim,relative=1]
+\chordmode {
+c:2 c:3 c:4 c:5
+c:6 c:7 c:8 c:9
+c:10 c:11 c:12 c:13
+}
+@end lilypond
+
+Since an unaltered 11 does not sound good when combined with an
+unaltered 13, the 11 is removed from a @code{:13} chord (unless it
+is added explicitly).
+
+@lilypond[quote,ragged-right,fragment,verbatim,relative=1]
+\chordmode { c1:13 c:13.11 c:m13 }
+@end lilypond
+
+@cindex additions, in chords
+
+Individual steps can be added to a chord. Additions follow the
+extent and are prefixed by a dot (@code{.}).
+
+@lilypond[quote,verbatim,fragment,relative=1]
+\chordmode { c1:5.6 c:3.7.8 c:3.6.13 }
+@end lilypond
+
+Added steps can be as high as desired.
+
+@lilypond[quote,verbatim,fragment,relative=1]
+\chordmode { c4:5.15 c:5.20 c:5.25 c:5.30 }
+@end lilypond
+
+@cindex chord steps, altering
+
+Added chord steps can be altered by suffixing a @code{-} or @code{+}
+sign to the number. To alter a step that is lower than the extent,
+add it as an altered step.
+
+@lilypond[quote,verbatim,fragment,relative=1]
+\chordmode { c1:7+ c:5+.3- c:3-.5-.7- }
+@end lilypond
+
+@cindex removals, in chords
+
+@funindex ^
+
+A step to be removed from the chord must come at the end of a
+modifier string and be by @code{^}. Only one removal with @code{^}
+is allowed in a modifier string.
+
+@lilypond[quote,verbatim,fragment,relative=1]
+\chordmode { c1^3 c:7^5 c:9^3.5 }
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