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<p>
<a name="Using-tags"></a>
Previous: <a rel="previous" accesskey="p" href="Using-variables.es.html#Using-variables">Using variables</a>,
Up: <a rel="up" accesskey="u" href="Different-editions-from-one-source.es.html#Different-editions-from-one-source">Different editions from one source</a>
<hr>
</div>
<h5 class="unnumberedsubsubsec">Using tags</h5>
<p><a name="index-g_t_005ctag-2423"></a><a name="index-g_t_005ctag-2424"></a>
<a name="index-g_t_005ckeepWithTag-2425"></a><a name="index-g_t_005ckeepWithTag-2426"></a>
<a name="index-g_t_005cremoveWithTag-2427"></a><a name="index-g_t_005cremoveWithTag-2428"></a>
<a name="index-tag-2429"></a><a name="index-keep-tagged-music-2430"></a><a name="index-remove-tagged-music-2431"></a>
The <code>\tag #'</code><var>partA</var> command marks a music expression
with the name <var>partA</var>.
Expressions tagged in this way can be selected or filtered out by
name later, using either <code>\keepWithTag #'</code><var>name</var> or
<code>\removeWithTag #'</code><var>name</var>. The result of applying these filters
to tagged music is as follows:
<p><table summary=""><tr align="left"><th valign="top" width="50%">Filter
</th><th valign="top" width="50%">Result
<br></th></tr><tr align="left"><td valign="top" width="50%">Tagged music preceded by <code>\keepWithTag #'</code><var>name</var>
</td><td valign="top" width="50%">Untagged music and music tagged with <var>name</var> is included;
music tagged with any other tag name is excluded.
<br></td></tr><tr align="left"><td valign="top" width="50%">Tagged music preceded by <code>\removeWithTag #'</code><var>name</var>
</td><td valign="top" width="50%">Untagged music and music tagged with any tag name other than
<var>name</var> is included; music tagged with <var>name</var> is
excluded.
<br></td></tr><tr align="left"><td valign="top" width="50%">Tagged music not preceded by either <code>\keepWithTag</code> or
<code>\removeWithTag</code>
</td><td valign="top" width="50%">All tagged and untagged music is included.
<br></td></tr></table>
<p>The arguments of the <code>\tag</code>, <code>\keepWithTag</code> and
<code>\removeWithTag</code> commands should be a symbol
(such as <code>#'score</code> or <code>#'part</code>), followed
by a music expression.
<p>In the following example, we see two versions of a piece of music,
one showing trills with the usual notation, and one with trills
explicitly expanded:
<blockquote>
<pre class="verbatim">
music = \relative g' {
g8. c32 d
\tag #'trills {d8.\trill }
\tag #'expand {\repeat unfold 3 {e32 d} }
c32 d
}
\score {
\keepWithTag #'trills \music
}
\score {
\keepWithTag #'expand \music
}
</pre>
<p>
<a href="../7f/lily-efb3b474.ly">
<img align="middle"
border="0" src="../7f/lily-efb3b474.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p class="noindent">Alternatively, it is sometimes easier to exclude sections of music:
<blockquote>
<pre class="verbatim">
music = \relative g' {
g8. c32 d
\tag #'trills {d8.\trill }
\tag #'expand {\repeat unfold 3 {e32 d} }
c32 d
}
\score {
\removeWithTag #'expand
\music
}
\score {
\removeWithTag #'trills
\music
}
</pre>
<p>
<a href="../28/lily-7e628fe0.ly">
<img align="middle"
border="0" src="../28/lily-7e628fe0.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p>Tagged filtering can be applied to articulations, texts, etc. by
prepending
<pre class="example">-\tag #'<var>your-tag</var>
</pre>
<p>to an articulation. For example, this would define a note with a
conditional fingering indication and a note with a conditional
annotation:
<pre class="example">c1-\tag #'finger ^4
c1-\tag #'warn ^"Watch!"
</pre>
<p>Multiple tags may be placed on expressions with multiple
<code>\tag</code> entries:
<blockquote>
<pre class="verbatim">
music = \relative c'' {
\tag #'a \tag #'both { a a a a }
\tag #'b \tag #'both { b b b b }
}
<<
\keepWithTag #'a \music
\keepWithTag #'b \music
\keepWithTag #'both \music
>>
</pre>
<p>
<a href="../c6/lily-0cf255bd.ly">
<img align="middle"
border="0" src="../c6/lily-0cf255bd.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p>Multiple <code>\removeWithTag</code> filters may be applied to a single
music expression to remove several differently named tagged sections:
<blockquote>
<pre class="verbatim">
music = \relative c'' {
\tag #'A { a a a a }
\tag #'B { b b b b }
\tag #'C { c c c c }
\tag #'D { d d d d }
}
{
\removeWithTag #'B
\removeWithTag #'C
\music
}
</pre>
<p>
<a href="../c4/lily-91622439.ly">
<img align="middle"
border="0" src="../c4/lily-91622439.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p>Two or more <code>\keepWithTag</code> filters applied to a single music
expression will cause <em>all</em> tagged sections to be removed, as
the first filter will remove all tagged sections except the one
named, and the second filter will remove even that tagged section.
<p class="noindent">
<h5 class="subsubheading">See also</h5>
<p class="indent">
<p>Learning Manual:
<a name="index-Organizing-pieces-with-variables-2432"></a><a href="../lilypond-learning/Organizing-pieces-with-variables.es.html#Organizing-pieces-with-variables">Organizing pieces with variables</a>.
<p>Notation Reference:
<a href="Automatic-part-combining.es.html#Automatic-part-combining">Automatic part combining</a>,
<a href="Including-LilyPond-files.es.html#Including-LilyPond-files">Including LilyPond files</a>.
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