4am in Fabric, a cavernous nightclub in London’s Clerkenwell district and the resident DJ, Terry Francis, has just dropped a twisted slab of techno which sends the packed dance floor wild. This is a moment repeated around the world: clubbers losing it to underground dance music, driven by – as the old house classic goes – a basement, a red light and a feeling. It’s a scene that’s been played out in basements around the world for the past forty years. However in recent years, something’s changed. More and more clubs are closing down and less and less young people...