The plot reflects the figure of Pascual Contursi, tango poet. In love with a singer, he leaves his wife and son to go with her. Some time later, the singer leaves him and he composes the tango that gives the film its title.
| Actor | Role |
|---|---|
 Jorge SalcedoPascual Contursi | Pascual Contursi |
 Diana MaggiNot listed | Not listed |
 María Esther GamasNot listed | Not listed |
| BBlanca del PradoNot listed | Not listed |
 Jacinto HerreraNot listed | Not listed |
 Pedro MarateaNot listed | Not listed |
 Aníbal TroiloNot listed | Not listed |
 Pascual PellicciottaNot listed | Not listed |
| EEnrique MartiánezNot listed | Not listed |
 Alfredo JordánNot listed | Not listed |
 María Luisa RobledoNot listed | Not listed |
 Roberto BlancoNot listed | Not listed |
| GGraciliano BatistaNot listed | Not listed |
 Max CitelliNot listed | Not listed |
 José María PedrozaNot listed | Not listed |
| NNéstor DevalNot listed | Not listed |
 Cayetano BiondoNot listed | Not listed |
 Raúl BeronDoblaje de Jorge Salcedo en las canciones | Doblaje de Jorge Salcedo en las canciones |