Sten meets Nina on a train ride. He feels attracted to her but he is already engaged to his fiancee Marie-Louise.
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.
Old fashioned teachers are taught swing dancing by a student.
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.
