diff --git a/vocoder/static/vocoder.js b/vocoder/static/vocoder.js
index 9f0e0e1..8de1cc9 100644
--- a/vocoder/static/vocoder.js
+++ b/vocoder/static/vocoder.js
@@ -122,6 +122,8 @@ class GeneratedShape {
 
     this.xDirection = 1;
     this.yDirection = 1;
+
+    this.synth = new p5.MonoSynth();
   }
 
   collide(shapes) {
@@ -158,7 +160,12 @@ class GeneratedShape {
     /**
      * Play a sound after a collision is detected.
      **/
-    return; // TODO: placeholder for now ...
+    var notes = ["G2", "C3", "G3"];
+    var duration = 0.8;
+    var time = 0;
+    var velocity = 0.5;
+    var index = random(0, notes.length + 1);
+    this.synth.play(notes[index], velocity, time, duration);
   }
 
   move() {