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Nirvana members (from left) Dave Grohl, Kurt Cobain and Krist Novoselic in London, circa 1992. Photo: TNS

For a new generation of fans and musicians, Nirvana — and in particular their frontman Kurt Cobain, who died 30 years ago this month — have provided not only inspiration but a blueprint for a more inclusive style of rock stardom, writes Hannah Ewens.