Here's your weekly mashup news: Someone named DJ O-Face has made a mashup mixtape that features Jay-Z's vocals over the bombed-out beats of Sleigh Bells. You can stream it below. It's okay, I guess. I kind of like the "Heart of the City"-"Rill Rill" mix, but the "Beach Girls"-"Girls Girls Girls" mix is pretty rough. I guess this proves that it's pretty damn hard to do rap over shit this booming and nutty.