var url = "https://archive.org/download/testmp3testfile/mpthreetest.mp3";

​

let createAudioElement = data => {

  // we need an <audio> and a <source> element, because that's how web audio works:

  let audio = new Audio();

  let source = document.createElement('source');

​

  // we know this is an mp3, so use that

  source.type = "audio/mpeg";

  let base64 = btoa(String.fromCharCode(...new Uint8Array(data)));

  source.src = `data:${source.type};base64,${base64}`;

  audio.appendChild(source);

​

  // And then we play it.

  audio.play();  

};

​

let handleMP3response = response => {

  response

    .arrayBuffer()

    .then(createAudioElement);

};

​

fetch(url)

.then(handleMP3response)

.catch(e => console.error(e));