The Austrian musical Premiere showcases the talents of Swedish stage and screen star Zara Leander. It's a backstage drama with the action equally divided on both sides of the curtain. As Fraulein Leander prepares for opening night, her life is thrown into turmoil by a variety of romantic misadventures. But she manages to show up on stage at the appointed time, scoring a huge success. It was reported that, during the filming of Zara Leander's musical numbers, the audience (ostensibly made up of paid extras) broke into spontaneous applause; when the film premiered in Vienna, the first-night moviegoers did the same.
http://www.imdb.com/title/tt0029437/
Zarah Leander ... Carmen Daviot
Attila Hörbiger ... Dr. Helder, Polizeikommissar
Karl Martell ... Fred Nissen
Theo Lingen ... Inspizient Dornbusch
Maria Bard ... Lydia Loo