I recently had a shocking experience at a concert. I’ve been to many, and they vary wildly in quality, but shocking is not a term I use lightly. A great show is a great thing for a reason: there’s a lot of boring and even awful music out there. Every genre is guilty of being terrible for reasons of talentlessness and avarice and cronyism and even sheer accident. I don’t usually mean to single out a particular genre in general, but to explain this shocking show it suffices to compare two critically acclaimed rap albums: October 2014’s Run the Jewels 2 by supergroup Run the Jewels [El-P and Killer Mike] and March 2015’s To Pimp a Butterfly by Kendrick Lamar. This comparison sets up the context for a review of a Kendrick Lamar show.