It's a testament to the quality of Killer Mike's R.A.P. Music that I've owned it for over a year on vinyl and, until today, have never tossed on the instrumental version. Mike's verses on the album are so dense, well-done and generally engaging that I missed a ton of subtle production work that El-P did throughout the album. The instrumental is its own beast, nearly a different album with all of the nuance and craft on it. My dad, who hates rap, walked into my room and asked what I had on. When I told him what it was he said, "Well, this might be the first rappy thing I put on my iPod."