- I'm at your service, monsieur.
- Thank you, Maestro. Thank you.

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

You can hear this line at 01:05:25.740 in the Blu-ray version of the movie.

Quote context

[...]

- May I have a word with you alone, Christine?

- That's what I came for. May I speak to you alone, Christine?

- But I'm going out.

- My carriage is outside.

- Well, I'm not going right now. I mean, I'm going later.

- I'll wait.

- Monsieur Villeneuve suggested you might be willing to perform this service in the cause of justice.

- Do you really think this Claudin would be tempted to leave his hiding place and risk his life merely to hear his own concerto?

- Played by Franz Liszt himself? Do you doubt it, Maestro?

- So many crimes have been committed in the name of music. It seems only fair to use it now to avert one.

- I'm at your service, monsieur.

- Thank you, Maestro. Thank you.

- Most exciting, this detective work. Most exciting.

- Well, it's more than exciting to me. I had the honor of being suspected of the crime.

- Monsieur Daubert. Please.

- Listen to this, monsieur.

- Another note.

- How this phantom knows everything is beyond me.

- If Madame Lorenzi sings, you will be responsible for what happens. This is your last warning.

[...]