Nevermind, the album by Nirvana, was released 20 years ago. We remember the cover art – a clearly circumcised baby boy, swimming in pursuit of a dollar bill dangled in front of him – but what about the blurry photo inside? It is an unwashed Kurt Cobain, middle finger in focus, with bandmates Dave Grohl (now a rock star) and bassist Krist Novoselic (politically active in Washington state) on his flanks. Nevermind was a masterpiece of dissent – a belligerent-but-melodic, flannel-flaunting, culture-shifting, genre-defining bleep you to the music industry’s fashion of the time, which was glam rock and poofy hair.