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HTML 

              
                <div id="controls">
    <div id="loading">Loading audio..</div>
  
    <button id="toggle_audio" class="pause"></button>
    <p>Inkqualizer</p>
</div>
<div id="credits">
    I don't own the audio.
</div>
<!-- HTML elements for the ink tanks -->
<div id="equalizer_container">
    <div class="ink_tank first">
        <div class="ink orange">
            <div class="ink_surface"></div>
            <div class="ink_empty"></div>
        </div>
    </div>
    <div class="ink_tank">
        <div class="ink yellow">
            <div class="ink_surface"></div>
            <div class="ink_empty"></div>
        </div>
    </div>
    <div class="ink_tank">
        <div class="ink green">
            <div class="ink_surface"></div>
            <div class="ink_empty"></div>
        </div>
    </div>
    <div class="ink_tank">
        <div class="ink purple">
            <div class="ink_surface"></div>
            <div class="ink_empty"></div>
        </div>
    </div>
    <div class="ink_tank">
        <div class="ink magenta">
            <div class="ink_surface"></div>
            <div class="ink_empty"></div>
        </div>
    </div>
</div>
!

CSS 

              
                @font-face{
    font-family: 'Splatoon';
    src: url('//s.cdpn.io/12109/Splatoon.eot');
    src: url('//s.cdpn.io/12109/Splatoon.eot?#iefix') format('embedded-opentype'),
         url('//s.cdpn.io/12109/Splatoon.woff2') format('woff2'),
         url('//s.cdpn.io/12109/Splatoon.woff') format('woff'),
         url('//s.cdpn.io/12109/Splatoon.ttf') format('truetype'),
         url('//s.cdpn.io/12109/Splatoon.svg#Splatoon') format('svg');
    font-weight: normal;
    font-style: normal;
}

body{
    background:#1f1f38;
    overflow:hidden;
}
*{font-family: 'Splatoon', Arial;
    font-weight: normal;
    font-size:34px;
    color:#aadc00;
    letter-spacing:2px;
}

#equalizer_container{
    width:1280px; height:720px;
    background: url(https://s.cdpn.io/12109/bg.jpg) 0 0 no-repeat;
    position:absolute; left:50%; top:0px; margin-left:-640px;
    border-radius:16px;
    box-shadow:inset 0 0 16px 5px #1f1f38;
}

.ink_tank{
    width:162px; height:459px;
    overflow:hidden;
    position:relative; float:left;
    margin-top:137px; margin-right:60px;
}
.ink_tank:before{
    content:"";
    width:100%;height:100%;
    background: url(https://s.cdpn.io/12109/ink_tank.png) 0 0 no-repeat;
    position:absolute; left:0px; top:0px;
    z-index:10;
}

.ink_tank.first{ margin-left:112px; }

.ink_tank .ink{
    width:122px; height:358px;
    position:absolute; left:20px; top:59px;
    background: url(https://s.cdpn.io/12109/ink.png) 0 0 no-repeat;
    overflow:hidden;
}
.ink.orange{    background-position:0px 0px; }
.ink.yellow{    background-position:-122px 0px; }
.ink.green{     background-position:-244px 0px; }
.ink.purple{    background-position:-366px 0px; }
.ink.magenta{   background-position:-488px 0px; }

.ink_surface{
    width:122px; height:96px;
    background: url(https://s.cdpn.io/12109/ink_surface.png);
    background-repeat:no-repeat;
    background-position:0px 0px;

    position:absolute; left:0px;top:1px;
    z-index:7; 
    transform-style: preserve-3d;
}
.ink_empty{
    width:122px; height:1px;
    background: #20201b;
    position:absolute; left:0px;top:0px;
    z-index:5;
    transform-style: preserve-3d;
}
#controls{
    width:1280px;height:128px;
    position:absolute;
    left:50%;top:570px;margin-left:-640px;
    z-index:100;
    text-align:center;
    display:block;
}

#toggle_audio{
    float:left;
    width:111px; height:111px;
    background:url(https://s.cdpn.io/12109/toggle_audio.png) 0 0 no-repeat;
    position:absolute;right:0px;top:0px;
}
#toggle_audio.pause{
    background-position:-111px 0px;
}

button{
    cursor:pointer;
    border:none;
    outline:none;
}
button:hover{
    transform: rotate(5deg) scale(1.1,1.1);
    transition:transform 0.1s ease;
}
#play_splatoon_music{
    width:96px;height:96px;
    position:absolute;left:0px;top:10px;
    border-radius:18px;
    background: url(https://31.media.tumblr.com/avatar_3535825f7605_128.png) 0 0 no-repeat;
    background-size:96px 96px;
}
#play_beat_loop{
    width:96px;height:96px;
    position:absolute;left:106px;top:10px;
    border-radius:18px;
    background: url(https://s.cdpn.io/12109/mj.png) 0 0 no-repeat;
}
#loading{
    width:1280px;height:48px;line-height:32px;
    color:#df36a5;
    position:absolute;left:0px;top:0px;
    display:none;
}
#credits{
    font-family:Arial;
    color:#843291;
    font-size:11px;
    width:100%; height:26px;
    position:absolute;left:0px;bottom:0px;
    text-align:center;
    letter-spacing:1px;
}

#drag_drop_area{
    border-radius:16px;
    width:96px;height:96px;
    border:3px dashed #aadc00;
    position:absolute;
    right:121px;top:0px;
    background:#1f1f38;
    box-shadow: 0 0 6px 2px transparent;
    transition:all 0.1s ease;
}
#drag_drop_area:before{
    content:'\2714';
    font-family:Arial;
    font-size:48px; line-height:96px;
    width:96px;height:96px;
    border-radius:16px;
    position:absolute;left:0px;top:0px;
    pointer-events:none;
    display:none;
}
#drag_drop_area:after{
    content:"Drag n drop music here!";
    font-size:21px;line-height:24px;
    pointer-events:none;
    width:180px;height:56px;
    position:absolute;left:-48px;top:-64px;
    transform: rotate(-10deg);
}
#drag_drop_area:hover, #drag_drop_area:active, #drag_drop_area.drop_aware{
    border-color:#fff;
    background:#2e2e54;
}
#drag_drop_area.drop_animate:before{
    display:block;
}
#drag_drop_area.drop_animate{
    transform: scale(0.94,0.94);
    box-shadow: 0 0 6px 2px rgba(170,220,0,1);
    background:#2e2e54;
}
!

JS 

              
                //Create the audio context  
if (! window.AudioContext){
    if (! window.webkitAudioContext) {
        alert('no audiocontext found');
    }
    window.AudioContext = window.webkitAudioContext;
}
var context = new AudioContext();
var audioBuffer;
var sourceNode;
var analyser;
var javascriptNode;

function setupAudioNodes(){
    //Setup a javascript node
    javascriptNode = context.createScriptProcessor(2048, 1, 1);
    //Connect our javascript node to the audio context destination
    javascriptNode.connect(context.destination);

    //Setup an analyzer
    analyser = context.createAnalyser();
    analyser.smoothingTimeConstant = 0.6;
    analyser.fftSize = 512;
    //Create a buffer source node
    sourceNode = context.createBufferSource();
    sourceNode.connect(analyser);
    analyser.connect(javascriptNode);

    sourceNode.connect(context.destination);
}

//Retrieves, loads and plays an audio URL
function loadSound(url){
    $("#loading").show();
    var request = new XMLHttpRequest();
    request.open('GET', url, true);
    request.responseType = 'arraybuffer';

    //When loaded, decode the data and play it
    request.onload = function(){
        $("#loading").hide();

        context.decodeAudioData(request.response, function(buffer){
            playSound(buffer);
        }, onError);
    };
    request.send();
}

//Gotta log those errors
function onError(e){
    console.log(e);
}

var inkBarHeight = 358;
var inkBarSurfaces = undefined;
var inkBarEmpties = undefined;

//Animate our ink bars
function drawSpectrum(barsArray){
    for(var i = 0; i < 5; i++){
        var value = barsArray[i];
        var changeInkShape = (Math.random() * 5) > 3; //Okay-ish chance of ink surface changing shape

        //Lets lie a bit about our audio levels, to make the visualizaton look a bit more crazy
        var newBarTop = inkBarHeight - Math.floor(((value - 140) / 112) * inkBarHeight);

        //Uncomment this to get the original accurate bar levels, no lies.
        //var newBarTop = inkBarHeight - Math.floor((value / 256) * inkBarHeight);

        //Change the amount of ink in the tank!
        $(inkBarEmpties).eq(i).css("height", newBarTop + 1);
        $(inkBarSurfaces).eq(i).css("top", newBarTop);
        //Change the shape of our ink surface!
        if(changeInkShape){
            if( $("#toggle_audio").hasClass("pause") ){
                var newPosX = Math.floor(Math.random() * 1158);
                $(inkBarSurfaces).eq(i).css("background-position", "-" + newPosX + "px 0px");
            }
        }
    }
}

var splatoonURL = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/12109/splatoon_bgm_loop_small.ogg";


//Start doing stuff once the page is loaded!
$(document).ready(function(){
    //Prepare everything that uses the DOM
    inkBarSurfaces = $("#equalizer_container .ink .ink_surface");
    inkBarEmpties = $("#equalizer_container .ink .ink_empty");

    $("#toggle_audio").on("click",function(el){
        if($(el.target).hasClass("pause")){
            sourceNode.disconnect();
        }
        else{
            sourceNode.connect(analyser);
            analyser.connect(javascriptNode);
            sourceNode.connect(context.destination);
        }
        $(el.target).attr("class", $(el.target).hasClass("pause") ? "play":"pause");
    });

    //Init and load the music
    setupAudioNodes();

    //Analyze our sound node, using an analyzer (duh)!
    javascriptNode.onaudioprocess = function(){
        //var barsArray =  new Uint8Array(analyser.frequencyBinCount); //256 equalizer bars by default
        var barsArray =  new Uint8Array(5); //5 equalizer bars
        //Get the channel average
        analyser.getByteFrequencyData(barsArray);
        //Splat the audio spectrum into our ink tanks
        drawSpectrum(barsArray);
    };

    loadSound(splatoonURL);
});

var bufferStarted = false;
//Lay down the beats, looped
function playSound(buffer){
    sourceNode.buffer = buffer;
    sourceNode.loop = true;
    sourceNode.disconnect();

    if(!bufferStarted){
        sourceNode.start(0);
        bufferStarted = true;
    }

    $("#toggle_audio").attr("class", "pause");
    sourceNode.connect(analyser);
    analyser.connect(javascriptNode);
    sourceNode.connect(context.destination);
}
!
999px

Console