diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..ddc9edb51f 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,23 @@
 
 <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>