It goes from a relaxing sound to a more upbeat towards the middle and back and forth. Matches with the lyrics, I think. As for the lyrics, where does she come up with this? How does she do it? Must be a heck of a ride being in a romantic relatioship with her, like the song suggests. What a song and what an artist is all I have to say. I like BoA too, but I'd like to hear something written from herself though.