What is some of the best recent rap / rock collaborations, can you list me sum. and maybe groups that do that?

recent ones, not aireosmith and run dmc, more like korn and dem franchize boyz. if it's a song that is more than a decade old, i probably know it already. i'm trying to mix in some sock rythems into gangstah rap. if you know some bands that do that, like a mix between flobots and 311, let me know, i might not know them.