House music jacked the world in the 1980s and popular music has never been the same. From the merest two or three nightclubs in Chicago, House leapt the Atlantic, creating a scene in places as unalike as Manchester's clubland and the beaches of Ibiza - and sometimes its reputation did, too. Now, Marshall Jefferson, long hailed as the Godfather of House Music, speaks of just what his contribution was and how responsible he, his friends and...