Tybalt, using a pseudonym (“the chimaera”), is the famous troll writer of all kinds of plays. May it be stuff from Shakespeare or all GODDAMN kinds of troll musicals.
The phantom of the opera is, by the way, his whole theme. The plot of the play, the whole music is pretty much his life and story, although of course it has his differences. He wrote the music based on his own fate, though.
Feel free to ask more! :3 (Although sorry taking a long time to answer!)