The original electro sound has been seeping back onto dancefloors, whether in the sets of DJs like Helena Hauff and Nina Kraviz or mix-comps by the likes of Steffi and Paul Woolford. There’s a fresh wave of new acts and labels supplying the goodness, with its deviation from the four-four inspiring many to look to the sound. But why electro, and why now? DJ Mag investigates...