@film I couldn't find the clip with English subtitles, sorry.
An off-screen conductor is leading a rehearsal and addresses the musicians.
The off-screen singer complains that they are rushing.
The conductor alerts them that the master (/maestro) wishes to speak.
Depardieu, as an elderly Marais, says: "All the notes should finish by dying." He falls back asleep.
The conductor says, "You heard him: let them die."
It's a hell of an opening. 2/3