A woman holds a sign as she takes part in a demonstration against a concert later in the day of former Pink Floyd musician Roger Waters in the Festhalle, in Frankfurt, Germany (Michael Probst/AP/PA) Several Jewish groups, politicians and an alliance of civil society groups gathered for a memorial ceremony and a protest rally against a concert by Roger Waters in Frankfurt on Sunday evening. They accuse the Pink Floyd co-founder of antisemitism, an allegation he denies. Waters has also drawn their ire for his support of the BDS movement, which calls for boycotts and sanctions against Israel. Frankfurt authorities...