Do a Jquery conditional test?

Question

I am making a page and I need it updated constantly, but only when the value of an external page I called with the Jquery.get() function is different from the one already contained in the file, it follows my jquery code...

$(document).ready(function() {
    setInterval(function()
    {
        $.ajaxSetup ({ cache: false });
        $.get("config-stream.php?pegar=musica-atual", function(verifica){

            var musicaAtual = $("#tudo").text();        
            if(verifica != musicaAtual){
                $("#tudo").html(verifica);
            }
        });
    }, 2000);
});

And the related HTML...

<div id="tudo">
    valorinicial
</div>
<p id="oi"></p>