The Essential Clash reveals the previously unheard-of persona that Strummer made up for himself: near-equal parts pop icon, prole gadfly, political nag, and all-round formal and human provocateur. (Bono flunks out of category four.) The DVD's output is slender, but memorable and startlingly undated--perhaps the only popular music of its period about which that might be said. The legacy is daunting. And the lyrics often form a queerly cheerful tombstone inscription for our era.