Singer appears too drunk to perform on European tour kickoff
                                
                                
                                    (Newser) -
                                    Amy Winehouse was in not-so-rare form last night, appearing a little too drunk to perform on the kickoff of her European tour in Belgrade. During the much-hyped 90-minute performance, Winehouse mumbled lyrics, struggled to keep up with her band, and wandered offstage twice as 20,000 fans booed. Tickets for...