diff --git a/.gitattributes b/.gitattributes
index 7632623..8eb495a 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -19,3 +19,5 @@
 *.as  binary
 
 *.mp3 binary
+*.ogg binary
+*.wav binary
diff --git a/bower.json b/bower.json
index 3cb92d9..9ffb42b 100644
--- a/bower.json
+++ b/bower.json
@@ -5,6 +5,7 @@
   "dependencies": {
     "red-sass": "~0.2.0",
     "particulate": "0.3.1",
-    "handlebars": "1.3.0"
+    "handlebars": "1.3.0",
+    "howler.js": "~1.1.25"
   }
 }
diff --git a/grunt/config/copy.js b/grunt/config/copy.js
index 9b7e5b8..620cecb 100644
--- a/grunt/config/copy.js
+++ b/grunt/config/copy.js
@@ -13,6 +13,7 @@ module.exports = function (config) {
         config.source + '*.{ico,txt}',
         config.source + '.htaccess',
         config.source + 'img/{,*/}*.{jpg,jpeg,png,webp,gif}',
+        config.source + 'audio/{,*/}*.{mp3,ogg,wav}',
         config.source + 'fonts/*',
         config.source + 'lib/modernizr/modernizr.js'
       ],
diff --git a/pages/_base.html b/pages/_base.html
index e5acada..924ea42 100644
--- a/pages/_base.html
+++ b/pages/_base.html
@@ -30,6 +30,7 @@ <h1>Medusae</h1>
 
     <div class="controls">
       <div id="toggle-info" class="controls-button" title="About"></div>
+      <div id="toggle-audio" class="controls-button" title="Audio"></div>
     </div>
 
     <div id="container"></div>
diff --git a/static/audio/bg-loop.mp3 b/static/audio/bg-loop.mp3
new file mode 100644
index 0000000..63153de
Binary files /dev/null and b/static/audio/bg-loop.mp3 differ
diff --git a/static/audio/bg-loop.ogg b/static/audio/bg-loop.ogg
new file mode 100644
index 0000000..0373e58
Binary files /dev/null and b/static/audio/bg-loop.ogg differ
diff --git a/static/js/app.js b/static/js/app.js
index 5fe6eee..91e5f63 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -13,11 +13,24 @@ require('js/items/*');
 require('js/scenes/*');
 require('js/controllers/*');
 
+var scene = App.MainScene.create();
+var audioToggle = App.ToggleController.create({
+  name : 'audio'
+});
+
 App.ModalController.create({
   name : 'info'
 });
 
 setTimeout(function () {
-  var scene = App.MainScene.create();
+  scene.initItems();
+  scene.initAudio();
+  scene.appendRenderer();
   scene.loop.start();
+
+  audioToggle.addListener(scene, 'toggleAudio');
 }, 0);
+
+setTimeout(function () {
+  audioToggle.toggleState();
+}, 2000);
diff --git a/static/js/controllers/AudioController.js b/static/js/controllers/AudioController.js
new file mode 100644
index 0000000..c0ceeb7
--- /dev/null
+++ b/static/js/controllers/AudioController.js
@@ -0,0 +1,123 @@
+/*global Howl*/
+var Tweens = App.Tweens;
+
+App.AudioController = AudioController;
+function AudioController(config) {
+  this._isEnabled = true;
+  this._urls = {};
+  this._soundNames = [];
+  this._volume = {};
+  this._volumeTarget = {};
+  this._playing = {};
+
+  this.baseUrl = config.baseUrl;
+  this.sounds = {};
+
+  this.tweenVolume = Tweens.factorTween(this._volume, 0.05);
+}
+
+AudioController.create = App.ctor(AudioController);
+
+AudioController.prototype.addSound = function (path, name) {
+  name = name || path;
+  var url = this.baseUrl + path;
+
+  this._soundNames.push(name);
+
+  this._urls[name] = [
+    url + '.mp3',
+    url + '.ogg'
+  ];
+};
+
+AudioController.prototype.createSound = function (name, params) {
+  var sound = this.sounds[name];
+  if (sound) { return sound; }
+
+  params = params || {};
+  params.urls = this._urls[name];
+
+  sound = new Howl(params);
+  sound.sid = name;
+
+  this._volume[name] = 0;
+  this._volumeTarget[name] = params.volume || 0;
+  this.sounds[name] = sound;
+  return sound;
+};
+
+AudioController.prototype.getSound = function (name) {
+  return this.sounds[name] || this.createSound(name);
+};
+
+AudioController.prototype.playSound = function (name) {
+  if (!this._isEnabled) { return; }
+  var sound = this.getSound(name);
+  if (!sound) { return; }
+  if (!sound._loaded) {
+    setTimeout(this.playSound.bind(this, name), 250);
+    return;
+  }
+
+  this._playing[name] = true;
+  sound.play();
+};
+
+AudioController.prototype.pauseSound = function (name) {
+  if (!this._playing[name]) { return; }
+  this.sounds[name].pause();
+  this._playing[name] = false;
+};
+
+AudioController.prototype.setVolume = function (name, volume) {
+  this._volumeTarget[name] = volume;
+};
+
+AudioController.prototype.stopSound = function (name) {
+  this.getSound(name).stop();
+};
+
+AudioController.prototype.stopAllSounds = function () {
+  var names = this._soundNames;
+  var sounds = this.sounds;
+  var sound;
+
+  for (var i = 0, il = names.length; i < il; i ++) {
+    sound = sounds[names[i]];
+    if (!sound) { continue; }
+    sound.stop();
+  }
+};
+
+AudioController.prototype.enableSound = function () {
+  this._isEnabled = true;
+};
+
+AudioController.prototype.disableSound = function () {
+  this._isEnabled = false;
+  this.stopAllSounds();
+};
+
+AudioController.prototype.update = function () {
+  var sounds = this.sounds;
+  var names = this._soundNames;
+  var playing = this._playing;
+  var volumeTarget = this._volumeTarget;
+  var name, sound, volume;
+
+  for (var i = 0, il = names.length; i < il; i ++) {
+    name = names[i];
+    sound = sounds[name];
+    if (!(sound && sound._loaded)) { continue; }
+
+    // Update volume
+    volume = this.tweenVolume(name, volumeTarget[name]);
+
+    if (volume < 0.0001 && playing[name]) {
+      sound.pause();
+    } else {
+      if (!playing[name]) { this.playSound(name); }
+      sound.volume(volume);
+    }
+  }
+};
diff --git a/static/js/controllers/ToggleController.js b/static/js/controllers/ToggleController.js
new file mode 100644
index 0000000..c16e967
--- /dev/null
+++ b/static/js/controllers/ToggleController.js
@@ -0,0 +1,42 @@
+App.ToggleController = ToggleController;
+function ToggleController(config) {
+  var name = config.name;
+  var toggle = this.toggle = document.getElementById('toggle-' + name);
+
+  this.isActive = config.isActive != null ? config.isActive : false;
+  this._toggleClassName = toggle.className;
+  this._listeners = [];
+
+  toggle.addEventListener('click', this.toggleState.bind(this), false);
+}
+
+ToggleController.create = App.ctor(ToggleController);
+
+ToggleController.prototype.addListener = function (context, fn) {
+  this._listeners.push({
+    context : context,
+    fn : fn
+  });
+};
+
+ToggleController.prototype.triggerListeners = function () {
+  var listeners = this._listeners;
+  var listener;
+
+  for (var i = 0, il = listeners.length; i < il; i ++) {
+    listener = listeners[i];
+    listener.context[listener.fn].call(listener.context, this.isActive);
+  }
+};
+
+ToggleController.prototype.toggleState = function (event) {
+  if (this.isActive) {
+    this.toggle.className = this._toggleClassName;
+    this.isActive = false;
+  } else {
+    this.toggle.className += ' active';
+    this.isActive = true;
+  }
+
+  this.triggerListeners();
+};
diff --git a/static/js/libs.js b/static/js/libs.js
index 6d7711d..9046f85 100644
--- a/static/js/libs.js
+++ b/static/js/libs.js
@@ -15,3 +15,5 @@ require('lib-extras/three/postprocessing/ShaderPass');
 require('lib-extras/three/postprocessing/TexturePass');
 require('lib-extras/three/postprocessing/MaskPass');
 require('lib-extras/three/postprocessing/BloomPass');
+
+require('lib/howler.js/howler.js');
diff --git a/static/js/scenes/MainScene.js b/static/js/scenes/MainScene.js
index 3b199e4..b5c9d3d 100644
--- a/static/js/scenes/MainScene.js
+++ b/static/js/scenes/MainScene.js
@@ -13,10 +13,8 @@ function MainScene() {
   this.initRenderer();
   this.initFxComposer();
   this.addPostFx();
-  this.onWindowResize();
-
   this.initControls();
-  this.initItems();
+  this.onWindowResize();
 
   camera.position.set(200, 100, 0);
   camera.lookAt(scene.position);
@@ -29,6 +27,10 @@ function MainScene() {
 
 MainScene.create = App.ctor(MainScene);
 
+// ..................................................
+// Graphics
+//
+
 MainScene.prototype.initRenderer = function () {
   var renderer = this.renderer = new THREE.WebGLRenderer({
     devicePixelRatio : this.pxRatio,
@@ -37,8 +39,15 @@ MainScene.prototype.initRenderer = function () {
 
   renderer.setClearColor(0x111111, 1);
   renderer.autoClear = false;
+};
+
+MainScene.prototype.appendRenderer = function () {
+  var canvas = this.renderer.domElement;
 
-  this.el.appendChild(renderer.domElement);
+  this.el.appendChild(canvas);
+  setTimeout(function () {
+    canvas.className = 'active';
+  }, 0);
 };
 
 MainScene.prototype.initFxComposer = function () {
@@ -104,6 +113,27 @@ MainScene.prototype.initItems = function () {
   dust.addTo(this.scene);
 };
 
+MainScene.prototype.onWindowResize = function () {
+  var width = window.innerWidth;
+  var height = window.innerHeight;
+  var pxRatio = this.pxRatio;
+  var postWidth = width * pxRatio;
+  var postHeight = height * pxRatio;
+
+  this.width = width;
+  this.height = height;
+
+  this.camera.aspect = width / height;
+  this.camera.updateProjectionMatrix();
+
+  this.renderer.setSize(width, height);
+  this.composer.setSize(postWidth, postHeight);
+};
+
+// ..................................................
+// Controls
+//
+
 MainScene.prototype.initControls = function () {
   var controls = new THREE.TrackballControls(this.camera, this.el);
 
@@ -122,23 +152,6 @@ MainScene.prototype.initControls = function () {
   this.controlsUp = controls.object.up;
 };
 
-MainScene.prototype.onWindowResize = function () {
-  var width = window.innerWidth;
-  var height = window.innerHeight;
-  var pxRatio = this.pxRatio;
-  var postWidth = width * pxRatio;
-  var postHeight = height * pxRatio;
-
-  this.width = width;
-  this.height = height;
-
-  this.camera.aspect = width / height;
-  this.camera.updateProjectionMatrix();
-
-  this.renderer.setSize(width, height);
-  this.composer.setSize(postWidth, postHeight);
-};
-
 MainScene.prototype.onDocumentKey = function (event) {
   switch (event.which) {
   case 32:
@@ -148,12 +161,55 @@ MainScene.prototype.onDocumentKey = function (event) {
   }
 };
 
+// ..................................................
+// Audio
+//
+
+MainScene.prototype.initAudio = function () {
+  var audio = this.audio = App.AudioController.create({
+    baseUrl : App.STATIC_URL + 'audio/'
+  });
+
+  audio.addSound('bg-loop', 'bgLoop');
+  audio.createSound('bgLoop', {
+    loop : true
+  });
+};
+
+MainScene.prototype.beginAudio = function () {
+  var audio = this.audio;
+
+  audio.playSound('bgLoop');
+  audio.setVolume('bgLoop', 1);
+  this._audioIsPlaying = true;
+};
+
+MainScene.prototype.pauseAudio = function () {
+  var audio = this.audio;
+
+  audio.setVolume('bgLoop', 0);
+  this._audioIsPlaying = false;
+};
+
+MainScene.prototype.toggleAudio = function () {
+  if (this._audioIsPlaying) {
+    this.pauseAudio();
+  } else {
+    this.beginAudio();
+  }
+};
+
+// ..................................................
+// Loop
+//
+
 MainScene.prototype.update = function (delta) {
   var up = this.controlsUp;
   var gravity = this.gravity;
 
   this.gravityForce.set(up.x * gravity, up.y * gravity, up.z * gravity);
   this.medusae.update(delta);
+  this.audio.update(delta);
 };
 
 MainScene.prototype.render = function (delta, stepProgress) {
diff --git a/static/js/utils/Tweens.js b/static/js/utils/Tweens.js
new file mode 100644
index 0000000..2f097d6
--- /dev/null
+++ b/static/js/utils/Tweens.js
@@ -0,0 +1,30 @@
+var Tweens = App.Tweens = {};
+
+// Tween to target by difference factor
+Tweens.factorTween = function (context, defaultFactor) {
+  return function (name, target, instanceFactor) {
+    var state = context[name];
+    if (state == null) { state = context[name] = target; }
+    var factor = instanceFactor || defaultFactor;
+
+    return context[name] += (target - state) * factor;
+  };
+};
+
+// Tween to target by fixed step
+Tweens.stepTween = function (context, defaultStep) {
+  return function (name, target, instanceStep) {
+    var state = context[name];
+    if (state == null) { state = context[name] = target; }
+    if (state === target) { return state; }
+    var step = instanceStep || defaultStep;
+    var dir = state < target ? 1 : -1;
+
+    if ((target - state) * dir < step) {
+      context[name] = target;
+      return state;
+    }
+
+    return context[name] += step * dir;
+  };
+};
diff --git a/static/scss/apps/_application.scss b/static/scss/apps/_application.scss
index 51dcd9d..4a8ed56 100644
--- a/static/scss/apps/_application.scss
+++ b/static/scss/apps/_application.scss
@@ -1,6 +1,19 @@
+body {
+  background: #1b1b1b;
+}
+
 #container {
   @include absolute(0);
   overflow: hidden;
+
+  canvas {
+    opacity: 0;
+    transition: opacity 2500ms 500ms;
+
+    &.active {
+      opacity: 1;
+    }
+  }
 }
 
 .controls {
@@ -11,6 +24,8 @@
 }
 
 .controls-button {
+  position: relative;
+  display: block;
   width: 50px;
   height: 50px;
   cursor: pointer;
@@ -24,7 +39,7 @@
     border-radius: 2px;
 
     background: #fff;
-    transition: background 100ms;
+    transition: background 200ms;
     content: "";
   }