If one strand in the heritage of the Sixties was high-cultural pretension, the other, its intimate inversion, was a hardening crust of knowing cynicism. The relative innocence of rock and roll was increasingly displaced by media-wise pop bands whose stock in trade was a derisive appropriation and degradation of the style forged by their immediate precursors. Much as popular romances and tabloid journalism had once fastened on to mass literacy for commercial advantage, so ‘punk' rock appeared in the Seventies in order to exploit the market for popular music. Presented as ‘counter-cultural' it was in fact parasitic upon mainstream culture, invoking violent images and radical language for frequently mercenary ends.