Lin-Manuel Miranda and executive music producer Alex Lacamoire talk about the evolution of the music featured in “In the Heights.” How it started from its beginning stages of fusing hip-hop and Latin sounds, to the current movie soundtrack. They even share one of the early demos of the song “Blackout.” Miranda also discusses how music was a part of his personal journey before making it to Broadway. He takes us back to opening night of “In the Heights” and an emotional moment he had with his sister minutes before his Broadway debut.