The Three Brox Sisters, of vaudeville fame, make their Vitaphone bow under one big garden hat, humming harmonies from the South. Their opening number is "Back In Your Own Back Yard," which they render with several skillful variations. They follow with a crooner and a song called "Call Of The South." Low voices register most successfully on the Vitaphone. so the performance of the Brox Sisters, with their mezzo-soprano and contralto, is flawless.