what is the allusion to Mozart's magic flute in terms of the significance of the novel?

Rick makes his way to the Opera House and enters during a performance of Mozart’s The Magic Flute. Rick loves this particular opera, and sits to listen for a while. The opera makes him think about the finiteness of life, how, once everything is gone, the “dust will have won, and how Mozart died in his thirties and whether his own life would come to such a premature end. Rick realizes that he “is part of the form-destroying process of entropy.” The opera continues and Rick sees that one of the opera’s characters, Pamina, is being played by Luba Luft. Luft has quite a beautiful voice and Rick knows that he will be a part of destroying that particular form.