Almost two days after a man armed with a knife killed three people and severely wounded four others at a festival in Germany’s western city of Solingen, musical instruments are still lying on the stage, overhead lights still shining. “We’ve offered to switch them off. But the police say it’s a crime scene,” says Philipp Müller, who helped organize the festival that should still be taking place. “It’s all quite dystopian,” he says on Sunday, standing next to what remains of a festival site, now a cordoned-off crime scene. He wants to return the instruments to the musicians, but understands the …