soundcloud.js

var context = new webkitAudioContext(),
    audio = new Audio(),
    source,
    // `stream_url` you'd get from 
    // requesting http://api.soundcloud.com/tracks/6981096.json
    url = 'https://api.soundcloud.com/tracks/6981096/stream' +
          '?client_id=SOMETHING_SECRET';
audio.crossOrigin = "anonymous"; // via http://stackoverflow.com/questions/31308679/mediaelementaudiosource-outputs-zeros-due-to-cors-access-restrictions-local-mp3
audio.src = url;
source = context.createMediaElementSource(audio);
source.connect(context.destination);
source.mediaElement.play();