Heut' ist der schönste Tag in meinem Leben 1936

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

A Star Fell from Heaven 1934

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.

When You're Young, the World Belongs to You 1934

A Song Goes Round the World 1933

A Song Goes Round the World is a 1933 German drama film directed by Richard Oswald and starring Joseph Schmidt, Viktor de Kowa and Charlotte Ander.

The Love Express 1931

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.