hi there is another site like mp3realm its www.mp3plz.com
here is the search plug in
<form name="searchform" onSubmit="if(document.searchform.search.value==''){alert('Sorry your search can not be blank!');return false;}" method="GET" action="http://www.mp3plz.com/index.php">
<input type="text" size="50" name="search">
<input type="submit" name="submit" value="Search Free Mp3's">
<input type="hidden" name="page" value="1">
<input type="hidden" name="changeurl" value="1">
</form>
hope it helps