Between 'Amelie,' and 'Anastasia,' 'Waitress' and 'School of Rock,' there’s been a recent glut of musicals on Broadway adapted from well-loved films. While taking your story from a movie that already exists, especially one with a pre-existing fan base may seem like a shortcut, it presents unique challenges for the people trying to bring it to stage: how can you change the tone of the movie enough so that the musical feels fresh (and the songs seem natural) but not so much that you lose whatever made the film a classic? How do you surprise the audience while still giving them their favorite moments?