Como desenvolver um site similar ao Montréal Sound Map

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
  function initialize() {
    var myLatlng = new google.maps.LatLng(-25.363882,131.044922);
    var myOptions = {
      zoom: 4,
      center: myLatlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    }
    var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    
    var marker = new google.maps.Marker({
        position: myLatlng, 
        map: map,
        title:"Hello World!"
    });   
  }
</script>