The music "Castle in the Sky" expresses: I really want to love you, but the love I can give you is so humble. I know you can't accept me quickly, so let me always Wait. Even though we are both old, I still love you. Knowing that we have both reached heaven, I still want to tell you that I still love you.

The music of "Castle in the Sky" is mainly electronic and synthesizer, with French horns, children's chorus, piano sketches, etc. The theme song is sung by Miss Anomi Inoue. Among them, the version sung by the Suginami Children's Choir can be said to be the voice of an angel, perfectly expressing the etherealness and sadness of "Castle in the Sky".