@@ -58,7 +58,24 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
+  function play($e) {
+    const audio = document.querySelector(`audio[data-key="${ $e.keyCode }"]`),
+          key = document.querySelector(`.key[data-key="${ $e.keyCode }"]`)
+    if (!audio) return
+    audio.currentTime = 0
+    audio.play()
+    key.classList.add('playing')
+  }
 
+  function stop($e) {
+    const { propertyName } = $e
+    if (propertyName !== 'transform') return
+    this.classList.remove('playing')
+  }
+
+  window.addEventListener('keydown', play)
+  const keys = document.querySelectorAll('.key')
+  keys.forEach(key => key.addEventListener('transitionend', stop))
 </script>