diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..3ab8150e3b 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 key = document.querySelector(`.key[data-key="${e.keyCode}"]`)
+  const audio = document.querySelector(`audio[data-key="${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');
+    console.log(e.propertyName);
+}
+
+const keys = document.querySelectorAll('.key')
+keys.forEach(key => key.addEventListener('transitionend',removeTransition))
+window.addEventListener("keydown", playSound);
+
 </script>