If you're looking for something abrasive to claw at your ears, this may just do the trick. Under The Pledge of Secrecy are an experimental grindcore band blasting their way out of Aachen, Germany. They write music that is largely void of mercy, crushing your senses note for note.
This is apparent through the bands latest release, "Black hole mass evolution". This is actually a well produced, yet outlandish, grinding effort which is fully worth indulging in. You can stream through and purchase the beast on Bandcamp if you so desire.