Released last year, Killer Mike's R.A.P. Music was a surprise hit for the Atlanta rapper and its producer, El-P. Not that the two weren't capable of making such a record, but the topics Mike discussed—Reaganomics, racism, urban blight—hit like a bomb in a softer rap market.

That's why this performance is a great look. Last night, Mike and El-P performed "Untitled" on Late Show with David Letterman. They didn't tone it down for the national TV audience. Watch the clip above.

[via RapRadar]