"
Close your eyes,
Let your your spirit start to soar.
And you'll live as you've never lived before.
Softly, deftly
Music shall caress you
Hear it, feel it
Secretly possess you
Open up your mind
Let your fantasies unwind
In this darkness that you know you cannot fight
The darkness of the music of the night
Let your mind
Start a journey through a strange new world
Leave all thoughts of the life you knew before
Let your soul take you where you long to be.
Only then can you belong to me
The Phantom is trying to convince Christine to forget her old life and tune in to the part of her soul that he has a hand on. He is trying to let her mind take over the dark side of her soul so he can have complete control of her decisions regarding her life now. "Only then can you belong to me".