Oscar-nominated songwriting couple Kristen Anderson-Lopez and Bobby Lopez (a Tony winner for Avenue Q and The Book of Mormon) reveal how they are a "break-into-song family" and discuss the inspiration behind Frozen mega-hit "Let It Go," which has been translated into a whopping 41 languages. In addition to the Lopezes, Tony-winning star Idina Menzel, who sings the song in the movie (like you didn't already know that!) says she receives a lot of email of kids covering the power ballad. Take a look at Nightline's report straight from the kingdom of Arendelle as the show delves into all the ways the unstoppable song is touching young people around the world.