Ultra-religious, and totally without any electronic influences. Could anything be more anti-Berlin? Stemming from the American northeast and south, Sacred Harp singing is a forceful bellowing of Christian lyrics via an antiquated ‘shape-note’ method – or a way of cleansing you of demons, we’re not sure. Following an American revival, it’s now big in Germany, and in Berlin attracts a motley mix of Germans and Neukölln expat types. The convention involves four singing sessions, two group lunches and an evening “social” – and you don’t have to be religious to go. This may be the edgiest new fad out there.