<Li> Debienne and Poligny: The previous managers of the opera house </Li> <Li> Carlotta: A spoiled prima donna; the lead soprano of the Paris Opera House . </Li> <Li> Madame Valérius: Christine's elderly guardian . </Li> <P> Leroux uses the operatic setting in The Phantom of the Opera to use music as a device for foreshadowing . Ribière makes note that Leroux was once a theatre critic and his brother was a musician, so he was knowledgeable about music and how to use it as a framing device . She uses the example of how Leroux introduces the song Danse Macabre which means "dance of death" in the gala scene which foreshadows the graveyard scene that comes later where the Phantom plays the fiddle for Christine and attacks Raoul when he tries to intervene . </P>

What is the phantom of the opera book about