Amy Winehouse was booed and jeered during a concert in Serbia's capital as she stumbled onto the stage, mumbled through her songs and wandered off. Serbian media described the concert late Saturday kicking off her European tour before about 20,000 fans as a "scandal" and a "disaster." The Blic daily said the concert was "the worst in the history of Belgrade." Winehouse, who has publicly struggled with drugs and alcohol, was almost an hour late, before stumbling to the stage and appearing...