diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
deleted file mode 100644
index 4070d32767..0000000000
--- a/01 - JavaScript Drum Kit/index-START.html
+++ /dev/null
@@ -1,66 +0,0 @@
-
-
-
-
- JS Drum Kit
-
-
-
-
-
-
-
- A
- clap
-
-
- S
- hihat
-
-
- D
- kick
-
-
- F
- openhat
-
-
- G
- boom
-
-
- H
- ride
-
-
- J
- snare
-
-
- K
- tom
-
-
- L
- tink
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
diff --git a/01 - JavaScript Drum Kit/index-FINISHED.html b/01 - JavaScript Drum Kit/index.html
similarity index 72%
rename from 01 - JavaScript Drum Kit/index-FINISHED.html
rename to 01 - JavaScript Drum Kit/index.html
index 1a16d0997c..295b7c565f 100644
--- a/01 - JavaScript Drum Kit/index-FINISHED.html
+++ b/01 - JavaScript Drum Kit/index.html
@@ -58,26 +58,29 @@
+ key.classList.add('playing');
+ }
+
+ function removeTransition(e){
+ if(e.propertyName !== 'transform') return;
+
+ this.classList.remove('playing');
+ }
+ const keys = document.querySelectorAll('.key');
+
+ keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+ window.addEventListener('keydown', playSound);
+