The annual music competition organised by Swedish public broadcasters Sveriges Television and Sveriges Radio to determine the country's representative for the Eurovision Song Contest.

The sisters Britta and Ellinor live with their grandfather, music professor Libergius, teacher and leader of the city's orchestra association. In the city there is also a youthful jazz band - to the professor's horror.

Sten meets Nina on a train ride. He feels attracted to her but he is already engaged to his fiancee Marie-Louise.

Old fashioned teachers are taught swing dancing by a student.