var musicArray=['Crashing Cars','Human','Mr.Brightside','Super Massive Black Hole','Twisted Transistor','Yellow','Seven Nation Army'];

var index=document.getElementById("index").value;
var fetch=document.getElementById("fetch");

function load(){
    document.getElementById("length").innerHTML=musicArray.length;
}
function chooseSong(){
   for(var x=0;x<musicArray.length;x++){
       if(x==index){
            document.getElementById("display").innerHTML="song: "+musicArray[x];
       }
   }

}
fetch.addEventListener("click",chooseSong);