Doc: Update for staff.itely

[lilypond.git] / Documentation / user / staff.itely

@c -*- coding: utf-8; mode: texinfo; -*-
@ignore
    Translation of GIT committish: FILL-IN-HEAD-COMMITTISH

    When revising a translation, copy the HEAD committish of the
    version that you are working on.  See TRANSLATION for details.
@end ignore

@c \version "2.11.57"

@node Staff notation
@section Staff notation

@lilypondfile[quote]{staff-headword.ly}

This section explains how to influence the staff appearance, print
scores with more than one staff, and how to apply specific
performance marks to single staves.

@menu
* Displaying staves::
* Modifying single staves::
* Writing parts::
@end menu


@node Displaying staves
@subsection Displaying staves

This section shows the different possibilities of creating and
grouping staves, which are marked at the beginning of each line
with either a bracket or a brace.

@menu
* Instantiating new staves::
* Grouping staves::
* Deeper nested staff groups::
@end menu


@node Instantiating new staves
@unnumberedsubsubsec Instantiating new staves

@cindex new staff
@cindex staff initiation
@cindex staff instantiation
@cindex staff, new
@cindex staff, single
@cindex drum staff
@cindex percussion staff
@cindex Gregorian transcription staff
@cindex rhythmic staff
@cindex tabstaff
@cindex tablature

@notation{Staves} (singular: @notation{staff}) are created with
the @code{\new} or @code{\context} commands.  For details, see
@ref{Creating contexts}.

The basic staff context is @code{Staff}:

@lilypond[verbatim,quote,relative=2]
\new Staff { c4 d e f }
@end lilypond

@code{DrumStaff} creates a five-line staff set up for a
typical drum set.  It uses different names for each instrument.
The instrument names are set using the @code{\drummode} command.
For details, see @ref{Percussion staves}.

@lilypond[verbatim,quote]
\new DrumStaff {
  \drummode { cymc hh ss tomh }
}
@end lilypond

@c FIXME: remove when mentioned in NR 2.8
@code{GregorianTranscriptionStaff} creates a staff to notate
modern Gregorian chant.  It does not show bar lines.

@lilypond[verbatim,quote,relative=2]
\new GregorianTranscriptionStaff { c4 d e f }
@end lilypond

@code{RhythmicStaff} creates a single-line staff that only
displays the rhythmic values of the input.  Real durations are
preserved. For details, see @ref{Showing melody rhythms}.

@lilypond[verbatim,quote,relative=2]
\new RhythmicStaff { c4 d e f }
@end lilypond

@code{TabStaff} creates a tablature with six strings in standard
guitar tuning.  For details, see @ref{Default tablatures}.

@lilypond[verbatim,quote,relative=2]
\new TabStaff { c4 d e f }
@end lilypond

There are two staff contexts specific for the notation of ancient
music: @code{MensuralStaff} and @code{VaticanaStaff}.  They are
described in @ref{Pre-defined contexts}.

Staves can be started or stopped at any point in the score.  The
commands @code{\startStaff} and @code{\stopStaff} are used for
this purpose.  For details, see @ref{Staff symbol}.


@seealso

Music Glossary:
@rglos{staff},
@rglos{staves}.

Notation Reference:
@ref{Creating contexts},
@ref{Percussion staves},
@ref{Showing melody rhythms},
@ref{Default tablatures},
@ref{Pre-defined contexts},
@ref{Staff symbol},
@ref{Gregorian chant contexts},
@ref{Mensural contexts}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{Staff},
@rinternals{DrumStaff},
@rinternals{GregorianTranscriptionStaff},
@rinternals{RhythmicStaff},
@rinternals{TabStaff},
@rinternals{MensuralStaff},
@rinternals{VaticanaStaff},
@rinternals{StaffSymbol}.


@node Grouping staves
@unnumberedsubsubsec Grouping staves

@cindex start of system
@cindex staff, multiple
@cindex staves, multiple
@cindex system start delimiters
@cindex bracket, vertical
@cindex brace, vertical
@cindex choir staff
@cindex grand staff
@cindex piano staff
@cindex staff group
@cindex staff, choir
@cindex staff, piano
@cindex system

Various contexts exist to group single staves together in order to
form multi-stave systems.  Each grouping context sets the style of
the system start delimiter and the behavior of bar lines.

If no context is specified, the default properties will be used:
the group is started with a vertical line, and the bar lines are
not connected.

@lilypond[verbatim,quote,relative=2]
<<
  \new Staff { c1 c }
  \new Staff { c1 c }
>>
@end lilypond

In the @code{StaffGroup} context, the group is started with a
bracket and bar lines are drawn through all the staves.

@lilypond[verbatim,quote,relative=2]
\new StaffGroup <<
  \new Staff { c1 c }
  \new Staff { c1 c }
>>
@end lilypond

In a @code{ChoirStaff}, the group starts with a bracket, but bar
lines are not connected.

@lilypond[verbatim,quote,relative=2]
\new ChoirStaff <<
  \new Staff { c1 c }
  \new Staff { c1 c }
>>
@end lilypond

In a @code{GrandStaff}, the group begins with a brace, and bar
lines are connected between the staves.

@lilypond[verbatim,quote,relative=2]
\new GrandStaff <<
  \new Staff { c1 c }
  \new Staff { c1 c }
>>
@end lilypond

The @code{PianoStaff} is identical to a @code{GrandStaff}, except
that it supports printing the instrument name directly.  For
details, see @ref{Instrument names}.

@lilypond[verbatim,quote,relative=2]
\new PianoStaff <<
  \set PianoStaff.instrumentName = "Piano"
  \new Staff { c1 c }
  \new Staff { c1 c }
>>
@end lilypond

Each staff group context sets the property
@code{systemStartDelimiter} to one of the following values:
@code{SystemStartBar}, @code{SystemStartBrace}, or
@code{SystemStartBracket}.  A fourth delimiter,
@code{SystemStartSquare}, is also available, but it must be
explicitly specified.


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{use-square-bracket-at-the-start-of-a-staff-group.ly}

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{display-bracket-with-only-one-staff-in-a-system.ly}

@cindex mensurstriche layout
@cindex renaissance music
@cindex transcription of mensural music
@cindex mensural music, transcription of

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{mensurstriche-layout-bar-lines-between-the-staves.ly}
@c FIXME: move to NR 2.8.x when sectioning is ready


@seealso

Music Glossary:
@rglos{brace},
@rglos{bracket},
@rglos{grand staff}.

Notation Reference:
@ref{Instrument names}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{Staff},
@rinternals{StaffGroup},
@rinternals{ChoirStaff},
@rinternals{GrandStaff},
@rinternals{PianoStaff},
@rinternals{SystemStartBar},
@rinternals{SystemStartBrace},
@rinternals{SystemStartBracket},
@rinternals{SystemStartSquare}.


@node Deeper nested staff groups
@unnumberedsubsubsec Deeper nested staff groups

@cindex staff, nested
@cindex staves, nested
@cindex nesting of staves
@cindex system start delimiters, nested
@cindex nested staff brackets
@cindex brackets, nesting of
@cindex braces, nesting of
@cindex inner staff group
@cindex inner choir staff group

Two additional staff-group contexts are available that can be
nested within a @code{StaffGroup} or @code{ChoirStaff} context:
@code{InnerStaffGroup} and @code{InnerChoirStaff}.  These contexts
create a bracket next to the original bracket of their parent
staff group.

An @code{InnerStaffGroup} is treated similarly to a
@code{StaffGroup}; bar lines are connected between each stave
within the context:

@lilypond[verbatim,quote,relative=2]
\new StaffGroup <<
  \new Staff { c2 c | c2 c }
  \new InnerStaffGroup <<
    \new Staff { g2 g | g2 g }
    \new Staff { e2 e | e2 e }
  >>
>>
@end lilypond

Bar lines are @emph{not} connected between staves of an
@code{InnerChoirStaff}, just like a @code{ChoirStaff}:

@lilypond[verbatim,quote,relative=2]
\new ChoirStaff <<
  \new Staff { c2 c | c2 c }
  \new InnerChoirStaff <<
    \new Staff { g2 g | g2 g }
    \new Staff { e2 e | e2 e }
  >>
  \new Staff { c1 | c1 }
>>
@end lilypond


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{nesting-staves.ly}


@seealso

Notation Reference:
@ref{Grouping staves},
@ref{Instrument names}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{InnerStaffGroup},
@rinternals{StaffGroup},
@rinternals{InnerChoirStaff},
@rinternals{ChoirStaff},
@rinternals{SystemStartBar},
@rinternals{SystemStartBrace},
@rinternals{SystemStartBracket},
@rinternals{SystemStartSquare}.


@node Modifying single staves
@subsection Modifying single staves

This section explains how to change specific attributes of one
staff: for example, modifying the number of staff lines or the
staff size.  Methods to start and stop staves and set ossia
sections are also described.

@menu
* Staff symbol::
* Ossia staves::
* Hiding staves::
@end menu


@node Staff symbol
@unnumberedsubsubsec Staff symbol

@cindex adjusting staff symbol
@cindex drawing staff symbol
@cindex staff symbol, setting of
@cindex stop staff lines
@cindex start staff lines
@cindex staff lines, amount of
@cindex staff lines, number of
@cindex staff line, thickness of
@cindex amount of staff lines
@cindex thickness of staff lines
@cindex ledger lines, setting
@cindex setting of ledger lines
@cindex spacing of ledger lines
@cindex number of staff lines

The lines of a staff belong to the @code{StaffSymbol} grob.
@code{StaffSymbol} properties can be modified to change the
appearance of a staff, but they must be modified before the staff
is created.

The number of staff lines may be changed.  The clef position and
the position of middle C may need to be modified to fit the new
staff.  For an explanation, refer to the snippet section in
@ref{Clef}.

@lilypond[verbatim,quote,relative=2]
\new Staff {
  \override Staff.StaffSymbol #'line-count = #3
  d4 d d d
}
@end lilypond

The vertical position of staff lines and the number of staff lines
can be defined at the same time.  As the following example shows,
note positions are not influenced by the position of the staff
lines.

@warning{The @code{'line-positions} property overrides the
@code{'line-count} property.  The number of staff lines is
implicitly defined by the number of elements in the list of values
for @code{'line-positions}}

@lilypond[verbatim,quote,relative=1]
\new Staff \with {
  \override StaffSymbol #'line-positions = #'(7 3 0 -4 -6 -7)
}
{ a4 e' f b | d1 }
@end lilypond

Staff line thickness can be modified.  The thickness of ledger
lines and stems are also affected, since they depend on staff line
thickness.

@lilypond[verbatim,quote,relative=1]
\new Staff \with {
  \override StaffSymbol #'thickness = #3
}
{ e4 d c b }
@end lilypond

The thickness of ledger lines can be set independently of staff
line thickness.

@lilypond[verbatim,quote,relative=1]
\new Staff \with {
  \override StaffSymbol #'ledger-line-thickness = #'(1 . 0.2)
}
{ e4 d c b }
@end lilypond

The distance between staff lines can be changed.  The setting has
influence on ledger lines as well.

@lilypond[verbatim,quote,relative=1]
\new Staff \with {
  \override StaffSymbol #'staff-space = #1.5
}
{ a4 b c d }
@end lilypond

The width of a staff can be adjusted.  The unit is one staff
space.  The spacing of objects inside the staff is not influenced
by this setting.

@lilypond[verbatim,quote,relative=1]
\new Staff \with {
  \override StaffSymbol #'width = #23
}
{ a4 e' f b | d1 }
@end lilypond

Further details about the properties of @code{StaffSymbol} listed
above can be found here: @rinternals{staff-symbol-interface}.

Modifications to staff properties in the middle of a score can be
placed between @code{\stopStaff} and @code{\startStaff}:

@lilypond[verbatim,quote,relative=2]
c2 c
\stopStaff
\override Staff.StaffSymbol #'line-count = #2
\startStaff
b2 b
\stopStaff
\revert Staff.StaffSymbol #'line-count
\startStaff
a2 a
@end lilypond


@predefined

@funindex \startStaff
@code{\startStaff},
@funindex \stopStaff
@code{\stopStaff}.


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{making-some-staff-lines-thicker-than-the-others.ly}


@seealso

Music Glossary:
@rglos{line},
@rglos{ledger line},
@rglos{staff}.

Notation Reference:
@ref{Displaying pitches}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{StaffSymbol},
@rinternals{staff-symbol-interface}.


@knownissues

When setting staff lines manually, bar lines are always drawn
centered on the position 0, so the maximum distance of the bar
lines in either direction must be equal.


@node Ossia staves
@unnumberedsubsubsec Ossia staves

@cindex staff, Frenched
@cindex ossia
@cindex Frenched staves
@cindex staff, resizing of
@cindex resizing of staves

@notation{Ossia} staves can be set by creating a new simultaneous
staff in the appropriate location:

@lilypond[verbatim,quote]
\new Staff \relative c'' {
  c4 b d c
  <<
    { c4 b d c }
    \new Staff { e4 d f e }
  >>
  c4 b c2
}
@end lilypond

However, the above example is usually not the desired result.  To
create ossia staves that are above the original staff, have no
time signature or clef, and have a smaller font size, tweaks must
be used.  The Learning Manual describes a specific technique to
achieve this goal, beginning with
@rlearning{Nesting music expressions}.

The following example uses the @code{alignAboveContext} property
to align the ossia staff.  This method is most appropriate when
only a few ossia staves are needed.

@lilypond[verbatim,quote]
\new Staff = main \relative c'' {
  c4 b d c
  <<
    { c4 b d c }

    \new Staff \with {
      \remove "Time_signature_engraver"
      alignAboveContext = #"main"
      fontSize = #-3
      \override StaffSymbol #'staff-space = #(magstep -3)
      \override StaffSymbol #'thickness = #(magstep -3)
      firstClef = ##f
    }
    { e4 d f e }
  >>
  c4 b c2
}
@end lilypond

If many isolated ossia staves are needed, creating an empty
@code{Staff} context with a specific @emph{context id} may be more
appropriate; the ossia staves may then be created by
@emph{calling} this context and using @code{\startStaff} and
@code{\stopStaff} at the desired locations.  The benefits of this
method are more apparent if the piece is longer than the following
example.

@lilypond[verbatim,quote,ragged-right]
<<
  \new Staff = ossia \with {
    \remove "Time_signature_engraver"
    \remove "Clef_engraver"
    fontSize = #-3
    \override StaffSymbol #'staff-space = #(magstep -3)
    \override StaffSymbol #'thickness = #(magstep -3)
  }
  { \stopStaff s1*6 }

  \new Staff \relative c' {
    c4 b c2
    <<
      { e4 f e2 }
      \context Staff = ossia {
        \startStaff e4 g8 f e2 \stopStaff
      }
    >>
    g4 a g2 \break
    c4 b c2
    <<
      { g4 a g2 }
      \context Staff = ossia {
        \startStaff g4 e8 f g2 \stopStaff
      }
    >>
    e4 d c2
  }
>>
@end lilypond

@c The following is the legacy "ossia.ly" example
@c
@c I don't think this method is very efficient.
@c I'm commenting it out for now.  -pm

@ignore

@ lilypond[verbatim,quote]
<<
  \new Staff \with
  {
    %No time signature in the ossia staff
    \remove "Time_signature_engraver"
    fontSize = #-3
    \override StaffSymbol #'staff-space = #(magstep -3)
    \override StaffSymbol #'thickness = #(magstep -3)
    firstClef = ##f
  }
  \relative c'' {
    \stopStaff
    \skip 2

    \startStaff
    \clef treble
    bes8[^"ossia" g bes g]
    \stopStaff

    s2

    \startStaff
    f8 d g4
  }
  \new Staff \relative c'' {
    \time 2/4
    c4 c g' g a a g2
  }
>>
@ end lilypond

@end ignore

Using the @code{\RemoveEmptyStaffContext} command to create ossia
staves may be used as an alternative.  This method is most
convenient when ossia staves occur immediately following a line
break.  In this case, spacer rests do not need to be used at all;
only @code{\startStaff} and @code{\stopStaff} are necessary.  For
more information about @code{\RemoveEmptyStaffContext}, see
@ref{Hiding staves}.

@lilypond[verbatim,quote,ragged-right]
<<
  \new Staff = ossia \with {
    \remove "Time_signature_engraver"
    \remove "Clef_engraver"
    fontSize = #-3
    \override StaffSymbol #'staff-space = #(magstep -3)
    \override StaffSymbol #'thickness = #(magstep -3)
  }
  \new Staff \relative c' {
    c4 b c2
    e4 f e2
    g4 a g2 \break
    <<
      { c4 b c2 }
      \context Staff = ossia {
        c4 e8 d c2 \stopStaff
      }
    >>
    g4 a g2
    e4 d c2
  }
>>

\layout {
  \context {
    \RemoveEmptyStaffContext
    \override VerticalAxisGroup #'remove-first = ##t
  }
}
@end lilypond


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{vertically-aligning-ossias-and-lyrics.ly}


@seealso

Music Glossary:
@rglos{ossia},
@rglos{staff},
@rglos{Frenched staff}.

Learning Manual:
@rlearning{Nesting music expressions},
@rlearning{Size of objects},
@rlearning{Length and thickness of objects}.

Notation Reference:
@ref{Setting the staff size}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{StaffSymbol}.


@node Hiding staves
@unnumberedsubsubsec Hiding staves

@cindex Frenched scores
@cindex staff, hiding
@cindex staff, empty
@cindex hiding of staves
@cindex empty staves
@cindex Frenched staves

In orchestral scores, staff lines that only have rests are usually
removed in order to save some space.  This style is called
@q{French Score}.  For the @code{Lyrics}, @code{ChordNames}, and
@code{FiguredBass} contexts, this is switched on by default.

For other staff contexts, this behavior is set with the
@code{\RemoveEmptyStaffContext} command.  It is set in the
@code{\layout} block.  As a result, empty staves or staves
containing multi-measure rests are removed after a line break.

@lilypond[verbatim,quote,ragged-right]
\layout {
  \context {
    \RemoveEmptyStaffContext
  }
}
\relative c'' {
  <<
    \new Staff { e4 f g a \break c1 }
    \new Staff { c4 d e f \break R1 }
  >>
}
@end lilypond

To remove other types of contexts, use
@code{\AncientRemoveEmptyStaffContext} or
@code{\RemoveEmptyRhythmicStaffContext}.

@cindex ossia

Another application of @code{\RemoveEmptyStaffContext} is to make
ossia sections, i.e., alternative melodies on a separate piece of
staff, with help of a Frenched staff.  For details, see
@ref{Ossia staves}.

Staff lines can be made invisible by removing the
@code{Staff_symbol_engraver} from the @code{Staff} context:

@lilypond[verbatim,quote]
\new Staff \with {
  \remove "Staff_symbol_engraver"
}
\relative c'' { c8 c c16 c c c c2 }
@end lilypond


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{removing-the-first-empty-line.ly}


@predefined

@funindex \RemoveEmptyStaffContext
@code{\RemoveEmptyStaffContext},
@funindex \AncientRemoveEmptyStaffContext
@code{\AncientRemoveEmptyStaffContext},
@funindex \RemoveEmptyRhythmicStaffContext
@code{\RemoveEmptyRhythmicStaffContext}.


@seealso

Notation Reference:
@ref{Staff symbol},
@ref{Ossia staves}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{ChordNames},
@rinternals{FiguredBass},
@rinternals{Lyrics},
@rinternals{Staff},
@rinternals{VerticalAxisGroup}.


@node Writing parts
@subsection Writing parts

This section explains how to insert tempo indications and
instrument names into a score.  Methods to quote other voices and
format cue notes are also described.

@menu
* Metronome marks::
* Instrument names::
* Quoting other voices::
* Formatting cue notes::
@end menu


@node Metronome marks
@unnumberedsubsubsec Metronome marks

@cindex tempo
@cindex beats per minute
@cindex metronome marking
@cindex metronome marking with text
@funindex \tempo

A basic metronome mark is simple to write:

@lilypond[verbatim,quote,relative=1]
\tempo 4 = 120
c2 d
e4. d8 c2
@end lilypond

Tempo indications with text can be used instead:

@lilypond[verbatim,quote,relative=2]
\tempo "Allegretto"
c4 e d c
b4. a16 b c4 r4
@end lilypond

Combining a metronome mark and text will automatically place the
metronome mark within parentheses:

@lilypond[verbatim,quote,relative=2]
\tempo "Allegro" 4 = 160
g4 c d e
d4 b g2
@end lilypond

In general, the text can be any markup object:

@lilypond[verbatim,quote,relative=2]
\tempo \markup { \italic Faster } 4 = 132
a8-. r8 b-. r gis-. r a-. r
@end lilypond

A parenthesized metronome mark with no textual indication may be
written by including an empty string in the input:

@lilypond[verbatim,quote,relative=2]
\tempo "" 8 = 96
d4 g e c
@end lilypond


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{printing-metronome-and-rehearsal-marks-below-the-staff.ly}

@c perhaps also an example of how to move it horizontally?

@c TODO add snippet to LSR -pm
To change the tempo in the MIDI output without printing anything,
make the metronome marking invisible

@example
\once \override Score.MetronomeMark #'transparent = ##t
@end example

@c TODO add snippet to LSR -pm
To print other metronome markings, use these markup commands

@lilypond[verbatim,quote,relative=1]
c4^\markup {
  (
  \smaller \general-align #Y #DOWN \note #"16." #1
  =
  \smaller \general-align #Y #DOWN \note #"8" #1
  ) }
@end lilypond

For more details, see @ref{Formatting text}.


@seealso

Music Glossary:
@rglos{metronome},
@rglos{metronomic indication},
@rglos{tempo indication},
@rglos{metronome mark}.

Notation Reference:
@ref{Formatting text},
@ref{MIDI output}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{MetronomeMark}.


@node Instrument names
@unnumberedsubsubsec Instrument names

@cindex instrument names
@cindex instrument names, short

Instrument names can be printed on the left side of staves for the
@code{Staff} and @code{PianoStaff} contexts.  The value of
@code{instrumentName} is used for the first staff, and the value
of @code{shortInstrumentName} is used for all succeeding staves.

@lilypond[verbatim,quote,ragged-right,relative=1]
\set Staff.instrumentName = "Violin "
\set Staff.shortInstrumentName = "Vln "
c1
\break
c''1
@end lilypond

Markup mode can be used to create more complicated instrument
names:

@lilypond[verbatim,quote,relative=2]
\set Staff.instrumentName = \markup {
  \column { "Clarinetti"
            \line { "in B" \smaller \flat } } }
c1
@end lilypond

@cindex instrument names, centering

When two or more staff contexts are grouped together, the
instrument names and short instrument names are centered by
default.  To center multi-line instrument names,
@code{\center-column} must be used:

@lilypond[verbatim,quote,relative=2]
<<
  \new Staff {
    \set Staff.instrumentName = \markup \center-column {
      Clarinetti
      \line { "in B" \smaller \flat }
    }
    c1
  }
  \new Staff {
    \set Staff.instrumentName = "Vibraphone"
    c1
  }
>>
@end lilypond

@cindex indent
@cindex short-indent

The @code{indent} and @code{short-indent} settings specify the
level of indentation for the first system and all succeeding
systems, respectively.  They can be modified in the @code{\layout}
block.  For instrument names or short instrument names that are
longer, it may be useful to increase the @code{indent} and
@code{short-indent} settings:

@lilypond[verbatim,quote]
\relative c' <<
  \new Staff \with {
    instrumentName = "Oboe"
  }
  { c2 d }
  \new Staff \with {
    instrumentName = "Glockenspiel"
  }
  { c'2 d }
>>

\layout {
  indent = 2.5\cm
}
@end lilypond

To add instrument names to other contexts (such as
@code{GrandStaff}, @code{ChoirStaff}, or @code{StaffGroup}),
@code{Instrument_name_engraver} must be added to that context.
For details, see @ref{Modifying context plug-ins}.

@cindex instrument names, changing

Instrument names may be changed in the middle of a piece:

@lilypond[verbatim,quote,ragged-right,relative=1]
\set Staff.instrumentName = "First"
\set Staff.shortInstrumentName = "one"
c1 c c c \break
c1 c c c \break
\set Staff.instrumentName = "Second"
\set Staff.shortInstrumentName = "two"
c1 c c c \break
c1 c c c \break
@end lilypond


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{aligning-and-centering-instrument-names.ly}


@seealso

Notation Reference:
@ref{Modifying context plug-ins}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{InstrumentName},
@rinternals{PianoStaff},
@rinternals{Staff}.


@node Quoting other voices
@unnumberedsubsubsec Quoting other voices

@cindex cues
@cindex quoting other voices
@cindex fragments
@cindex cue notes

Quotations allow fragments of other parts to be inserted directly
into a music expression.  Before a part can be quoted, the
@code{\addQuote} command must be used to initialize the quoted
fragment.  This command must be used in the toplevel scope.  The
first argument is an identifying string, and the second is a music
expression:

@example
flute = \relative c' @{
  f4 fis g gis
@}
\addQuote "flute" @{ \flute @}
@end example

The @code{\quoteDuring} command may then be used to indicate when
the quotation should take place.  The corresponding measures from
the quotation are inserted into the music expression.  The syntax
is similar to @code{\addQuote}:

@lilypond[verbatim,quote]
flute = \relative c' {
  f4 fis g gis
}
\addQuote "flute" { \flute }

\relative c' {
  c4 cis \quoteDuring #"flute" { s2 }
}
@end lilypond

If the music expression used for @code{\quoteDuring} contains
anything but a spacer rest or multi-measure rest, a polyphonic
situation is created, which is often not desirable:

@lilypond[verbatim,quote]
flute = \relative c' {
  f4 fis g gis
}
\addQuote "flute" { \flute }

\relative c' {
  c4 cis \quoteDuring #"flute" { c4 b }
}
@end lilypond

Quotations recognize instrument transposition settings for both
the source and target instruments if they are specified using the
@code{\transposition} command:

@lilypond[verbatim,quote]
clarinet = \relative c' {
  \transposition bes
  f4 fis g gis
}
\addQuote "clarinet" { \clarinet }

\relative c' {
  c4 cis \quoteDuring #"clarinet" { s2 }
}
@end lilypond

@c add to snippets, possibly.  It might already be there.  -pm
@c
@c The type of events that are present in the quoted music can be
@c trimmed with the @code{quotedEventTypes} property.  The default
@c value is @code{(note-event rest-event)}, which means that only
@c notes and rests of the quoted voice end up in the
@c @code{\quoteDuring}.  Setting
@c
@c @example
@c \set Staff.quotedEventTypes =
@c        #'(note-event articulation-event dynamic-event)
@c @end example
@c
@c @noindent
@c will quote notes (but no rests), together with scripts and
@c dynamics.


@snippets

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{quoting-another-voice-with-transposition.ly}

@lilypondfile[verbatim,lilyquote,texidoc,doctitle]
{quoting-another-voice.ly}


@seealso

Notation Reference:
@ref{Instrument transpositions}.

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{QuoteMusic},
@rinternals{Voice}.


@knownissues

Only the contents of the first @code{Voice} occurring in an
@code{\addQuote} command will be considered for quotation, so
@var{music} cannot contain @code{\new} and @code{\context Voice}
statements that would switch to a different Voice.

Quoting grace notes is broken and can even cause LilyPond to
crash.

Quoting nested triplets may result in poor notation.

In earlier versions of LilyPond (pre 2.11), @code{addQuote} was
written entirely in lower-case letters: @code{\addquote}.


@node Formatting cue notes
@unnumberedsubsubsec Formatting cue notes

@cindex cues
@cindex cue notes
@cindex cue notes, formatting
@cindex fragments
@cindex quoting other voices
@cindex cues, formatting

The previous section explains how to quote other voices.  The
@code{\cueDuring} command is a more specialized form of
@code{\quoteDuring}, being particularly useful for inserting cue
notes into a part.  The syntax is as follows:

@example
  \cueDuring #@var{partname} #@var{voice} @var{music}
@end example

This command copies the corresponding measures from @var{partname}
into a @code{CueVoice} context.  The @code{CueVoice} is created
implicitly, and occurs simultaneously with @var{music}, which
creates a polyphonic situation.  The @var{voice} argument
determines whether the cue notes should be notated as a first or
second voice; @code{DOWN} corresponds to the first voice, and
@code{UP} corresponds to the second.

@lilypond[verbatim,quote]
oboe = \relative c'' {
  r2 r8 d16 f e g f a
  g8 g16 g g2.
}
\addQuote "oboe" { \oboe }

\new Voice \relative c'' {
  \cueDuring #"oboe" #UP { R1 }
  g2 c,
}
@end lilypond

In the above example, the @code{Voice} context had to be
explicitly declared, or else the entire music expression would
belong to the @code{CueVoice} context.

The name of the cued instrument can be printed by setting the
@code{instrumentCueName} property.

@lilypond[verbatim,quote]
oboe = \relative c''' {
  g4 r8 e16 f e4 d
}
\addQuote oboe { \oboe }

\new Staff \relative c'' <<
  \new CueVoice \with {
    instrumentCueName = "ob."
  }
  \new Voice {
    \cueDuring #"oboe" #UP { R1 }
    g4. b8 d2
  }
>>
@end lilypond

The @code{\killCues} command is used to remove the cue notes from
a music expression.

@lilypond[verbatim,quote]
flute = \relative c''' {
  r2 cis2 r2 dis2
}
\addQuote flute { \flute }

\new Voice \relative c'' {
  \killCues {
    \cueDuring #"flute" #UP { R1 }
    g4. b8 d2
  }
}
@end lilypond

When typesetting cue notes, some guidelines should be followed:

@itemize
@item
The instrument playing the cue should be clearly marked on the
score.

@item
When the cue notes end, the name of the original instrument should
be indicated.

@item
Any other changes introduced by the cued part should also be
undone.  For example, if the cued instrument plays in a different
clef, the original clef should be stated once again.

@end itemize

@c FIXME explain syntax of \transposedCueDuring

The @code{\transposedCueDuring} command is useful to add cues for
instruments in a completely different register.  Having piccolo
cues within a contrabassoon part is a good example.

@lilypond[verbatim,quote]
piccolo = \relative c''' {
  \clef "treble^8"
  R1
  c8 c c e g2
  a4 g g2
}
\addQuote "piccolo" { \piccolo }

cbassoon = \relative c, {
  \clef "bass_8"
  c4 r g r
  \transposedCueDuring #"piccolo" #UP c,, { R1 }
  c4 r g r
}

<<
  \new Staff = "piccolo" \piccolo
  \new Staff = "cbassoon" \cbassoon
>>
@end lilypond


@seealso

Snippets:
@rlsr{Staff notation}.

Internals Reference:
@rinternals{CueVoice},
@rinternals{Voice}.


@knownissues

Collisions are not checked between @code{Voice} and
@code{CueVoice} contexts.