diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..17c83e1884 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,26 @@
 
 <script>
 
+function playSound(e) {
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+    const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+    key.classList.add('playing');
+    if(!audio) return;
+    audio.currentTime = 0;
+    audio.play();
+  }
+
+  function removeTransition(e) {
+    if(e.propertyName != 'transform') return;
+    this.classList.remove('playing');
+  }
+
+  window.addEventListener('keydown', playSound);
+
+  const keys = document.querySelectorAll('.key');
+  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+
+
 </script>