pan> <span style="color: #00AFFF; font-weight: bold;">a_</span> <span style="color: #00AFFF; font-weight: bold;">a</span> <span style="color: #00AFFF; font-weight: bold;">b_</span> <span style="color: #00AFFF; font-weight: bold;">b</span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># diatonic sequence</span></span></span>
<span class="r-in"><span><span class="fu">pitch_seq</span><span class="op">(</span><span class="st">"c"</span>, <span class="fl">8</span>, key 