“Dub-dub” is the sound the wheels make as DJ Robert Soko drives his taxi over the spot in the road where the Berlin wall once stood. It also echoes the East-meets-West beat of rousing Balkan rhythms blended with Western music that Soko launched onto the European club scene in 1993, under the name Balkan Beats. As a young refugee from former Yugoslavia, Soko organized dance nigh...