It is because the music can display wide range of emotions,and never gets boring.Breath-takingly exciting action tracks with lots of percussion reflect to the hardships of the journey of Milo and his companion,while the ethereal choir is excellent at displaying different emotions one by one or at the same time(wonder and amazement to illustrate the wonders and glory of Atlantis,sorrow and joy,determination and even more emotions).This soundtrack is a true masterpiece by James Newton Howard.