HTML5 Audio onCanPlayThrough()

Hi all,
I don't see the message !!

What am I doing wrong?

I'm using GWT 2.6,FF,CHROME

Thanks in advance

Audio audio=Audio.createIfSupported();
        audio.setSrc("sound.mp3");// 300KB size
        audio.load();
        audio.addCanPlayThroughHandler(new CanPlayThroughHandler() {
           
            @Override
            public void onCanPlayThrough(CanPlayThroughEvent event) {
                // TODO Auto-generated method stub
                Window.alert("mp3 loaded");
            }
        });
        audio.play();

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