For all the sound and fury of Nirvana's epochal album, Nevermind, it's significant that the album's best and most affecting song is also among the quietest. "Lithium" is an emotionally devastating tale of a blissfully blank member of some nameless religious cult, where "Sunday morning is everyday," and he's allowed an unquestioning faith to whitewash his fears, anxieties, and brutally negative self-image, without ever really clearing them away. Kurt Cobain is the very picture of measured calm in the song's verses, where his low, open guitar lines sketch in the outlines of the song's melody. But when the song comes to its chorus, Cobain hits the distortion pedal on his Marshall, and the rage and denial he's been bottling up inside himself pours out, as his many agonies -- "I love you," "I miss you," "I killed you" -- are punctuated with the determined wail that "I'm not gonna crack." The liberating force of Nirvana's inspired anger was rarely more powerful than in the service of this song, about someone who refused to liberate themselves and paid a terrible emotional price.