Answer: "Flowers fade/ The fruits of summer fade"
During the rehearsal for a new production of Chalumeau's "Hannibal", Carlotta, who plays the lead Elissa, decides to quit. Christine is therefore asked to sing on Carlotta's behalf and step into the part of Elissa - a part which includes the beautiful aria "Think of Me". It is when Christine sings this song that Raoul, her childhood friend, recognizes her.