The hit song “Let It Go” is afforded copyright protection because it is a musical work.Deciding who is the owner of this copyright is more complex. The song was written by Kristen Anderson-Lopez and Robert Lopez for the movie “Frozen.”Because they wrote this song for Disney and were paid, Disney is considered the author. Because Disney is considered the author, it is the owner of the copyright and are the party that can decide whether or not to bring suit over infringement.