Death Grips. This is the toughest and most powerfull experimental hiphop i have come across since ages. I have to admit though, that i can not listen to it longer than for 5 tracks or so - in other respects i would go nuts. The group from California consisting of vocalist Stefan Burnett and production team Zach Hill (mad drum skills!!!) & Andy Morin just released their new album (offical release 24th of april, but for some reason this album is available on itunes in some countries already ;)) "Guillotine" (Ex Military Mixtape) was a banger last year. In 2012 Death Grips signed with Epic Records for two albums. Looking forward to what will follow next. Also check their website "thirdworlds" for loads of quality content - e.g. "Ex Military" Mixtape free download + instrumentals, acapellas, videos..!