The first half an hour is an above average musical about a big band which travels south of the border to Rio for a nightclub engagement, and gets involved in romance, and performs a few Latin numbers. There's a love triangle led by Dolores Del Rio who is tempted by the handsome band leader (Gene Raymond) away from her hometown squeeze (Paul Roulien).
It's one of many jazz combo musicals released in the golden age. But on about 30m, during a long Latin dance spectacular- The Carioca- there is suddenly magic. For the first time ever on screen, Fred Astaire dances with Ginger Rogers. And it all briefly becomes sublime. And then the number ends and we're left with Del Rio, Raymond and Roulien and a poor script.
The stars are actually fine, and quite sexy. We see Dolores momentarily in a two piece bathing costume a year before Maureen O'Sullivan did famously in a Tarzan film which led to a ban under the Production Code! Gene emerges hunkily unclothed from a shower. And the big title finale with the showgirls strapped to the wings of light aircraft... is astonishing.
This would be the esoteric delight of precode nerds, if not for the debut together of Fred and Ginger. They sing one song each, without much impact. But when they come together on the dance floor, lightning strikes. Fred wasn't looking for a partner but the public response meant the studio starred them in a further nine musicals, which would substantially define '30s cinema.