Punk was like some kind of natural catastrophe: in terms of the frantic pace of pop-music it happened an eon ago, but the shockwaves that spread outward from its point of impact, like a tsunami, get more powerful the more open ocean they traverse. Our understanding of popular music before punk is now characterised by a growing awareness of its crypto-oppositional qualities; and the narrative of its subsequent history is dominated by its influence on all kinds of rock music, and a lot of electronic music as well.