var track = document.querySelector("track"), 
	track_div = document.getElementById("track");
track.addEventListener('cuechange', function () {
  let cues = track.track.activeCues;  // array of current cues
  console.log("cuechange", cues, cues[0].text, cues[0].startTime, cues[0].endTime);
  var d = JSON.parse(cues[0].text);
  console.log("d",d);
  track_div.innerHTML = d.title;
  var playing = document.getElementById(d.title);
  playing.classList.add("now_playing");
  console.log("playing",playing);
});