diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..4251b1cae6 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,31 @@
 
 <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; //will stop function if no corresponding audio element
+  audio.currentTime = 0; //rewinds the file to the beginning
+  audio.play();
+  key.classList.add('playing');
+
+  const keys = document.querySelectorAll('.key');
+
+  function removeTransition(e) {
+    if (e.propertyName !== 'transform') return; //skip if it's not a transform
+    this.classList.remove('playing');
+  }
+  
+  keys.forEach(key => key.addEventListener('transitionend', removeTransition))
+}
+
+window.addEventListener('keydown', playSound);
+// window.addEventListener('keyup', function(e) {
+//   const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+//   key.classList.remove('playing');
+// })
 </script>