button>
      <button
        class="main-button"
        id="record-audio"
        title="Record an audio clip"
      >
        <span>Record an audio clip</span>
      </button>
      <button class="main-button" id="playlist-actions" popovertarget="playlist-actions-popover" popovertargetaction="toggle" title="More tools...">
        <span>More tools...</span>
      </button>
    </section>

    <canvas id="waveform"></canvas>

    <div id="song-actions-popover" popover>
      <button class="popover-item so