At first glance it looks like you modernizr script isn't loading properly.
Do you have the following linked properly in your <head>
?
<script src="js/vendor/modernizr-2.6.2.min.js"></script>
When you originally downloaded the bootstrap folder from HTML5Boilerplate there should have been a js folder - if you copied the js folder properly into your own website, you should have the following vender folder with the modernizr script, which makes your website more compatible with anything under IE9.
Update
I tried finding the following:
http://www.yandasmusic.com/Portals/_default/Skins/Yandas-Response/js/vendor/modernizr-2.6.2-respond-1.1.0.min.js
But it returned a 404 error - that could be because I am forbidden from accessing those folders, but you should double check and make sure that it works.