"I seem insincere because I can't choose or decide fast enough," writes Cobain. In Nirvana he hoped to create a reflection of, and antidote to, all that. The band was to be the sound of authenticity. But what was authentic? In a 1988 letter to a friend, beside the word Nirvana done out in big, spidery letters, Cobain scribbles, "Ooo, eerie, mystical, doom".