/span><span class="p">(</span><span class="k">lambda</span><span class="w"> </span><span class="p">(</span><span class="nf">beat</span><span class="p">)</span>
</span><span id="__span-3-16"><a href="#__codelineno-3-16" id="__codelineno-3-16" name="__codelineno-3-16"></a><span class="w">    </span><span class="p">(</span><span class="k">let</span><span class="w"> </span><span class="p">((</span><span class="nf">dur</span><span class="w"> </span><span class="mi">1/4</span><span class="p">)</span>
</span><span