diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..6e9a2e9711 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -58,6 +58,23 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
+  function playSound(e) {
+      const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+      const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+      if(!audio) return;
+      audio.currentTime = 0;
+      audio.play();
+      key.classList.add('playing');
+  }
+
+  function removeTransition(e) {
+    if(e.propertyName !== 'transform') return;
+    this.classList.remove('playing');
+  }
+
+  const keys = document.querySelectorAll('.key');
+  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+  window.addEventListener('keydown', playSound);
 
 </script>