Play Chords</button>
        <button class="play-melodies">Play Melodies</button>
        <button class="play-harmony">Play Harmony</button>
        <button class="play-melody">Play Melody</button>
        <button class="play-all">Play All</button>
        <button class="stop-audio" style="display:none;">Stop Audio</button>
      </div>
      <div class='audio-error' style="display:none;">Audio is not supported in this browser.</div>
    </main>
  </div>
</body>
</html>
