In her dazzling career, Makeba performed with musical legends from around the world — jazz maestros Nina Simone and Dizzy Gillespie, Harry Belafonte, Paul Simon — and sang for world leaders such as John F. Kennedy and Nelson Mandela.Town Mayor Francesco Nuzzo said Makeba collapsed late Sunday at the end of a concert against organized crime, which has been blamed for the local massacre in September of six immigrants from Ghana.