There’s a scene early in the second act of ‘Primeval,’ now in theaters, in which the mostly American protagonists are treated to a musical performance by African natives in the bush, who then wait expectantly for the Americans to sing something from their own culture in return. When female lead Brooke Langton (‘Swingers’) starts with a thin, tuneless rendition of ‘Amazing Grace,’ comic-relief drone Orlando Jones shakes his head and mutters, ‘This