- Every violinist has written a concerto! Come, come, my dear Claudin.
- But I have faith in this one, as much faith as I had in Mademoiselle DuBois when I came to you three years ago. Now, I was right about her, Signor. And I'm right about this.

13 seconds sound clip from the Phantom of the Opera (1943) movie soundboard.

You can hear this line at 00:22:31.263 in the Blu-ray version of the movie.

Quote context

[...]

- But that isn't true.

- As a matter of fact, if you had the money, she might be launched on a career very soon.

- I assume that Mademoiselle DuBois has not the means to pay for her own instructions.

- Why, her month's salary wouldn't be enough to pay for one of your lessons.

- But I have written a concerto. Now, will you trust me if I can arrange to have it published?

- Every violinist has written a concerto! Come, come, my dear Claudin.

- But I have faith in this one, as much faith as I had in Mademoiselle DuBois when I came to you three years ago. Now, I was right about her, Signor. And I'm right about this.

- Pleyel and Desjardines are certain to publish it and they'll give me a substantial advance. You'll see.

- It's a shame. Pleyel's in there with his etchings.

- Why don't they tell the poor devil he won't see anyone today instead of torturing him like this?

- He'll see me?

- No. He is too busy today.

[...]