Rock music inhabits a world of permanent revolution. Today’s biggest bands will most likely be tomorrow’s tired old has-beens. But just occasionally artists and groups find a way of reinventing themselves and outlasting the constant fluctuations in fashion and taste. Stephen Sackur speaks to the singer-songwriter Brett Anderson. His band Suede was hailed as the future of Rock'n'Roll back in the early 1990s. Today they are still making music a generation after Britpop ceased to be a thing. So what keeps him going?