*nods* Hamilton plays with a *bazillion* conventions. Duet/not-duet, hip-hop/rap/pop/jazz as the modern analogs to prose/doggerel/blank verse in telling the characters' backgrounds apart, time signatures, singing... even the use of silence. There's even a character who's not officially credited that plays Death's incarnation... she's called #thebullet... (oooh, Death as *female*... ) and the fourth wall is kind of a half-wall that people can talk over, lean on, all but do backflips over...

And in the end it doesn't just tell Alexander's story, but Phillip's, Eliza's, Angelica's.... and, very indirectly, Peggy's. What you're looking for is the comment by AlannaR off "And Peggy!" that starts "Peggy may not have been involved in politics, but she was kind of a total badass." Which wouldn't have gotten out there if Peggy hadn't been featured in the show.

And the final line shatters the fourth wall once and for all, asking the audience directly (and ending in unison, unaccompanied):

o/~ Who lives, who dies who tells your story o/~

Catharsis. He masters it.