Add blurb about Kievan notation to changes

[lilypond.git] / Documentation / notation / simultaneous.itely

diff --git a/Documentation/notation/simultaneous.itely b/Documentation/notation/simultaneous.itely
index 00740cdfcef9e5a83f42c0ec261c384877f8f139..4ded8656e032fd3c70dbebe2e335158d66857305 100644 (file)
--- a/Documentation/notation/simultaneous.itely
+++ b/Documentation/notation/simultaneous.itely
@@ -78,6 +78,22 @@ they will not print.
 <a\f c( e>1 <a c) e>\f <a\< c e>( <a\! c e>) <a c e>\< <a c e> <a c e>\!
 @end lilypond
 
+@cindex chords, empty
+@cindex placeholder events
+
+A chord acts merely as a container for its notes, its articulations and
+other attached elements.  Consequently, a chord without notes inside
+does not actually have a duration.  Any attached articulations will
+happen at the same musical time as the next following note or chord and
+be combined with them (for more complex possibilities of combining such
+elements, see @ref{Simultaneous expressions}):
+
+@lilypond[verbatim,quote,relative=2]
+\grace { g8[( a b] }
+<> ) \p \< -. -\markup \italic "sempre staccato"
+\repeat unfold 4 { c4 e }  c1\f
+@end lilypond
+
 @cindex relative pitch, chords
 @cindex chords, relative pitch
 
@@ -130,6 +146,7 @@ enharmonic transcription of one or more pitches,
 
 @end itemize
 
+
 @node Chord repetition
 @unnumberedsubsubsec Chord repetition
 
@@ -243,8 +260,17 @@ a << { a4 b g } { d4 g c, } >>
 @end lilypond
 
 This can be useful if the simultaneous sections have identical
-rhythms, but attempts to attach notes with different durations
-to the same stem will cause errors.
+rhythms, but attempts to attach notes with different durations to
+the same stem will cause errors.  Notes, articulations, and property
+changes in a @emph{single} @samp{Voice} are collected and engraved in
+musical order:
+
+@lilypond[quote,verbatim,relative=2]
+<a c>4-.  <>-. << c a >>  << { c-. <c a> } { a s-. } >>
+@end lilypond
+
+Multiple stems or beams or different note durations or properties at
+the same musical time require the use of multiple voices.
 
 The following example shows how simultaneous expressions can
 generate multiple staves implicitly:
@@ -254,7 +280,8 @@ generate multiple staves implicitly:
 << { a4 b g2 } { d4 g2 c,4 } >>
 @end lilypond
 
-Here different rhythms cause no problems.
+Here different rhythms cause no problems because they are
+interpreted in different voices.
 
 @cindex collisions, clashing note columns
 @cindex collisions, ignoring
@@ -301,7 +328,6 @@ Ordinary notes and clusters can be put together in the same staff,
 even simultaneously.  In such a case no attempt is made to
 automatically avoid collisions between ordinary notes and clusters.
 
-
 @seealso
 Music Glossary:
 @rglos{cluster}.
@@ -314,9 +340,7 @@ Internals Reference:
 @rinternals{ClusterSpannerBeacon},
 @rinternals{Cluster_spanner_engraver}.
 
-
 @knownissues
-
 Clusters look good only if they span at least two chords; otherwise
 they appear too narrow.
 
@@ -327,6 +351,7 @@ separating rest between them.
 
 Clusters do not produce MIDI output.
 
+
 @node Multiple voices
 @subsection Multiple voices
 
@@ -538,9 +563,6 @@ music do not have the same rhythm.
 @code{\oneVoice}.
 @endpredefined
 
-Snippets:
-@rlsr{Simultaneous notes}.
-
 @seealso
 Learning Manual:
 @rlearning{Voices contain music},
@@ -551,6 +573,9 @@ Notation Reference:
 @ref{Invisible rests},
 @ref{Stems}.
 
+Snippets:
+@rlsr{Simultaneous notes}.
+
 
 @node Voice styles
 @unnumberedsubsubsec Voice styles
@@ -591,7 +616,6 @@ standard presentation.
 @code{\voiceNeutralStyle}.
 @endpredefined
 
-
 @seealso
 Learning Manual:
 @rlearning{I'm hearing Voices},
@@ -835,6 +859,7 @@ The requirements for successfully merging different note heads that
 are at the same time differently dotted are not clear.
 @end ignore
 
+
 @node Automatic part combining
 @unnumberedsubsubsec Automatic part combining
 
@@ -1001,7 +1026,6 @@ instrumentTwo = \relative c' {
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {changing-partcombine-texts.ly}
 
-
 @seealso
 Music Glossary:
 @rglos{a due},
@@ -1018,7 +1042,6 @@ Internals Reference:
 @rinternals{Voice}.
 
 @knownissues
-
 All @code{\partcombine...} functions can only accept two voices and are
 not designed to work with lyrics; such that when one of the voices is
 explicitly named in order to attach lyrics to it, the partcombiner will
@@ -1163,7 +1186,6 @@ global = {
 }
 @end lilypond
 
-
 @seealso
 Learning Manual:
 @rlearning{Organizing pieces with variables}.