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Nirvana's album cover for Nevermind.
A furious Kurt Cobain threatened to break up Nirvana at the height of their fame after an article claimed he and his pregnant wife had gone on a heroin binge.
The guitarist was so outraged by Vanity Fair's references to Courtney Love he angrily scrawled a message to the head of his label in which he declared "f**k Nirvana".
This previously unseen letter which shows the singer tried to protect his family from the limelight has emerged for the first time at auction with a £21,000 price tag.