musicVK.js

var aud = document.getElementsByClassName('current_audio')[0].textContent;
var audio = aud;
var memmory = [];
memmory.push(audio);
setIterval(()=>{
  aud = document.getElementsByClassName('current_audio')[0].textContent;
  if(audio != aud){
    memmory.push(aud);
    audio = aud;
  }
},5000)