Nirvana formed in 1987, released their first LP in 1989, and unintentionally tore the music world asunder two years later with the video and single for "Smells Like Teen Spirit." At the time, MTV and rock 'n' roll in general were largely dominated by vapid hair metal acts. Nirvana, with their thrift-store clothes and pawnshop guitars, represented a much-needed return to punk-inspired rock and at the same time validated the indie rock scene that had...