diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..8eb213ecf6 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,29 @@
 
 <script>
 
+  function removeTransition(e) {
+    if (e.propertyName !== "transform") return;
+    this.classList.remove("playing");
+  }
+
+  function playAudio(e) {
+    const key = document.querySelector(`.key[data-key="${e.keyCode}"]`); 
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+    
+    if (audio == null) {return};
+    
+    audio.currentTime = 0;
+    audio.play();
+
+    key.classList.add("playing");
+  }
+
+  window.addEventListener('keydown', playAudio);
+
+  const keys = document.querySelectorAll('.key');
+  keys.forEach(key => key.addEventListener("transitionend", removeTransition));
+
+
 </script>