British singer Rebecca Ferguson performs at Batschkapp in Frankfurt, Germany, April 7, 2014. The British singer is on a performing tour in Berlin, Munich, Stuttgart, Cologne, Frankfurt and Hamburg this April. It is the first time that Ferguson tours Germany. (Xinhua/Luo Huanhuan)

British singer Rebecca Ferguson performs at Batschkapp in Frankfurt, Germany, April 7, 2014. The British singer is on a performing tour in Berlin, Munich, Stuttgart, Cologne, Frankfurt and Hamburg this April. It is the first time that Ferguson tours Germany. (Xinhua/Luo Huanhuan)

British singer Rebecca Ferguson performs at Batschkapp in Frankfurt, Germany, April 7, 2014. The British singer is on a performing tour in Berlin, Munich, Stuttgart, Cologne, Frankfurt and Hamburg this April. It is the first time that Ferguson tours Germany. (Xinhua/Luo Huanhuan)

British singer Rebecca Ferguson performs at Batschkapp in Frankfurt, Germany, April 7, 2014. The British singer is on a performing tour in Berlin, Munich, Stuttgart, Cologne, Frankfurt and Hamburg this April. It is the first time that Ferguson tours Germany. (Xinhua/Luo Huanhuan)

British singer Rebecca Ferguson performs at Batschkapp in Frankfurt, Germany, April 7, 2014. The British singer is on a performing tour in Berlin, Munich, Stuttgart, Cologne, Frankfurt and Hamburg this April. It is the first time that Ferguson tours Germany. (Xinhua/Luo Huanhuan)