Inga and her father, the violin maker Lars, are big music enthusiasts. One day they meet the violinist Jan-Erik.
| Actor | Role |
|---|---|
 Nils KihlbergJan-Erik Wallbo | Jan-Erik Wallbo |
 Eva HenningInga Bergius | Inga Bergius |
 Sigurd WallénLars Bergius | Lars Bergius |
 Irma ChristensonMaud Welander | Maud Welander |
 Ernst EklundGeorg Welander | Georg Welander |
 Lasse DahlquistMacce Bergius | Macce Bergius |
 Eric AbrahamssonAnders Wirén | Anders Wirén |
 Carl StrömProf. Qvist | Prof. Qvist |
 Anders FrithiofProf. Hammarberg | Prof. Hammarberg |
 Rune HalvarssonSture Gylling | Sture Gylling |
 Jullan KindahlMrs. Johansson | Mrs. Johansson |
 Einar AxelssonRagnar | Ragnar |
 Olav RiégoSecretary | Secretary |
 Ragnar WidestedtClerk in Concert hall | Clerk in Concert hall |
| IIngemar HoldeJocke | Jocke |
| GGunnar EkwallPråmen | Pråmen |