stetxems

function readableDuration(seconds) {
    sec = Math.floor( seconds );    
    min = Math.floor( sec / 60 );
    min = min >= 10 ? min : '' + min;    
    sec = Math.floor( sec % 60 );
    sec = sec >= 10 ? sec : '0' + sec;    
    return min + ':' + sec;
    }
        setTimeout(function(){
            var timeMusic = document.querySelectorAll('.time-music');
            for (let index = 0; index < timeMusic.length; index++) {
                timeMusic[index].innerHTML = readableDuration(audio.duration); 
            }
        }, 200);