A memorial ceremony and rally are to be held in protest against a concert by Pink Lloyd star Roger Waters in Frankfurt on Sunday night. Police in Germany have started an investigation into the British musician on suspicion of incitement after he was filmed wearing a long black coat and red armband - featuring crossed hammers instead of swastikas - during a performance in the country's capital earlier this month. Waters also pretended to fire an imitation machine gun during a skit between songs. Several Jewish groups, politicians and an alliance of civil society groups have accused the Pink Floyd...