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music = chord("c' es' g'")
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</pre><div class="variablelist" title="Optional idbyname header variables"><p class="title"><b>Optional idbyname header variables</b></p><dl><dt><span class="term"><code class="literal">filldir = vertic</code></span></dt><dd><a class="indexterm" name="id2618683"></a><p>Tell the direction the buttons are filled. Default value is <code class="literal">horiz</code>.</p><p>Modules: <code class="literal">idbyname</code>.</p></dd><dt><span class="term"><code class="literal">fillnum</code></span></dt><dd><a class="indexterm" name="id2618712"></a><p>Tell how many buttons there are in each row or column.
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The default value is 1.</p><p>Modules: <code class="literal">idbyname</code>.</p></dd><dt><span class="term"><code class="literal"><a name="lf-labelformat"></a>labelformat</code><code class="literal"> = progression</code></span></dt><dd><a class="indexterm" name="id2618742"></a><p>The default value is <code class="literal">normal</code>.
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</pre><div class="variablelist" title="Optional idbyname header variables"><p class="title"><b>Optional idbyname header variables</b></p><dl><dt><span class="term"><code class="literal">filldir = vertic</code></span></dt><dd><a class="indexterm" name="id2615946"></a><p>Tell the direction the buttons are filled. Default value is <code class="literal">horiz</code>.</p><p>Modules: <code class="literal">idbyname</code>.</p></dd><dt><span class="term"><code class="literal">fillnum</code></span></dt><dd><a class="indexterm" name="id2615975"></a><p>Tell how many buttons there are in each row or column.
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The default value is 1.</p><p>Modules: <code class="literal">idbyname</code>.</p></dd><dt><span class="term"><code class="literal"><a name="lf-labelformat"></a>labelformat</code><code class="literal"> = progression</code></span></dt><dd><a class="indexterm" name="id2616005"></a><p>The default value is <code class="literal">normal</code>.
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Set to <code class="literal">progression</code> for lesson files where the name of the
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questions is a harmonic progression, written in a undocumented, but not
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difficult format. Check some existing lesson file to see how it works.