Two twin brothers working in a Vienna fair and who are both gifted for singing meet different luck both in love and their careers.

Musical about a girl typist who leaves Berlin for Venice after winning a contest. A rich bachelor pretending to be poor takes a job with her and competes for her affections with a count and a tenor. No print of the film is known to survive, and it is therefore a lost film. It is based on the operetta Es lebe die Liebe by Alexander Engel and Wilhelm Sterk. It was one of a cycle of operetta films made during the early sound era. A French-language version, Venetian Nights (Nuits de Venise), also directed by Wiene, was released the same year. From Wikipedia.

Despite his magnificent voice, the singer Riccardo is far too short to have a career on stage. Through cunning, he manages to work his way up to become the director of the radio station and quickly becomes popular. He falls in love with the saleswoman Nina, who adores the tenor’s voice and is disappointed when she meets him in person...

In this comedy, a talented singer is hired to dub the voice of a star who has lost his own. During the film's premiere, news that he sang the songs slips out and suddenly he finds that he himself has become a star. Unfortunately he soon encounters unanticipated problems. He is especially concerned about his girl friend who dumped him in favor of the voiceless star.

Joseph Reiner, a talented music student, tries to get a contract from a film and music producer, aided by Annerl, the girl he loves, and his music school fellows. When famous screen tenor Lincoln gets suddenly indisposed he will have a chance, yet not exactly the one he expected.

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Set in Venice, the touching and sometimes unintentionally comic story of a diminutive tenor who falls in love whilst striving for success. Also filmed in German as Ein Lied geht um die Welt.