Former Berlin resident David Bowie was among the performers at a pop concert in West Berlin in 1987 credited with helping to create the atmosphere that led, two years later, to the fall of the Berlin Wall. During the three-day concert, there were riots in East Berlin as East Berliners were prevented by police from gathering near the Berlin Wall to listen. And German journalist Christoph Lanz tells Louise Hidalgo it was the first time shouts were heard of 'the wall must go'.