Sweat works its way through all the hallmarks we've come to expect from Nelly records: the electro-syncopated beats, the droolingly witty rhymes (''Sex in the city, sex in the country/Sex in the zoo, right behind the monkeys''), and enough references to his financial portfolio to make you think you're hearing a singing CEO. Buffeted by a sample of Curtis Mayfield's ''Superfly,'' Nelly and Christina Aguilera slurp each other up in ''Tilt Ya Head Back,'' and he dabbles in synthreggae (''River Don't Runn'') and bombast (''Heart of a Champion,'' surely a future sports-show anthem). The album inevitably deteriorates into generic boasts via guest rappers, and the single ''Flap Your Wings'' is a lame retread of Nelly past.

