On 20 June last year, people in Berlin’s Lustgarten were part of a Europe-wide Singalong flash mob. In Germany alone, spontaneous mass vocalising took place across a number of cities. Together we sang three well-known numbers, hymns to cohesion and our communal dream of sunshiny social utopia: Beethovens’ and Schiller’s “Ode to Joy”, John Lennon’s…