The exuberant sound of Rio de Janeiro's Carnival, Brazil's most famous export -- the samba -- has gained a worldwide audience with its infectious beats and sensuous rhythms. This rousing documentary tours the country, from ghettos to music schools, to explore the origins and influences of the genre. Interviews with and performances by such samba stars as Gilberto Gil, Milton Nascimento and Chico Barque make this a special treat for fans.