After opening her European tour with “the worst concert in the history of Belgrade”, Amy Winehouse has canceled her next several performances. In Belgrade, Winehouse frequently fell behind her songs or stopped singing altogether; stumbled; and chatted off-mic with her band. She has canceled appearances this week in both Athens and Istanbul. "Despite feeling sure that she wanted to fulfill these commitments, she has agreed with management that she cannot perform to the best of her ability and will return home," a statement said. "She would like to apologize to fans expecting to see her at the shows but feels that this is the right thing to do." Her next scheduled show is July 8 in Spain.