We meet the young violinist Erik Smith in the lap of his family with his wife Lise and his little daughter Lone. Erik is a young, aspiring musician who dreams of one day making a career as an interpreter of the great masters of music. At a concert where a well-known solo violinist has to interrupt, Erik Smith suddenly jumps in and gets his big breakthrough.
| Actor | Role |
|---|---|
 Mogens WiethErik Smith, violinist | Erik Smith, violinist |
 Lis SmedLise Smith | Lise Smith |
 Johannes MeyerWalter S. Nielson, impresario | Walter S. Nielson, impresario |
 Charles WilkenWallengreen, fhv. kapelmusikus | Wallengreen, fhv. kapelmusikus |
 Ilselil LarsenLone Smith | Lone Smith |
 Jens KjeldbyKaj Petersen, kapelmester | Kaj Petersen, kapelmester |
| BBlanche FunchFru Annie | Fru Annie |
 Henry NielsenPortier på jazzklub | Portier på jazzklub |
 Jørgen IngmannMusiker | Musiker |
 Svend AsmussenMusiker | Musiker |
| EEdvard HambroInspektør | Inspektør |
 Frits HelmuthNot listed | Not listed |
| EElse KordtNot listed | Not listed |
| GGrete KordtNot listed | Not listed |
| EErik FrederiksenNot listed | Not listed |
| LLeo MathisenNot listed | Not listed |
| MMax LethNot listed | Not listed |
| IInga KordtNot listed | Not listed |