I happen to be the avid black metal head that listens to this genre daily (it not necessarily promote an evil message) and it's a coincidence to find this topic in a Jewish site.. I'm amazed.
This below is a one female front-woman band from Iraq. Very anti islamic. haha
Also, bands like Tadnees and Al namrood from Saudi Arabia are anti-islam! Check 'em out.
This proves there is a normal conscience within the muslim world.