This pretty song featured in the movie The Chronicles of Narnia: Prince Caspian. The meaning has been described as about those you trust in difficult times, about going away to do what is right and just. "Pick a star on the dark horizon And follow the light You'll come back when it's over No need to say goodbye"
Other songs like this one:
True Colours - Cyndi Lauper
Beautiful friendship affirmation ballad. While not specifically a goodbye song, it is too lovely not to dedicate to a loved one that is leaving.
