diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..166be9e0b3 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -58,7 +58,24 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
+  function playSound(e) {
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"`);
+    if (!audio) return;
+    audio.currentTime = 0; // resets audio time to always start at keydown
+    audio.play();
 
+    const element = document.querySelector(`.key[data-key="${e.keyCode}"]`)
+    element.classList.add('playing');
+  }
+
+  function removePlaying(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', removePlaying)); // adds listener to each element, so we'll have the correct ~this~ value
 </script>