Canadian heavy noise rock ala the jesus lizard mixed with the melvins, converge, unsane (free downloads): http://www.arctodusrecords.com/store.htm

If you like mathcore, you should take a look to THE ALGORITHM ! (You can download the free demo here : http://bringthesilence.blogspot.com/2009/12/algorithm-demo-2009.html ) Myspace : http://www.myspace.com/thealgorithmband