Lyrics:

This song is on the album Century Child, which has a theme of puppets and control/domination, often sexualized. The Phantom of the Opera cover emphasizes the thematic function of this dominance imagery.
In sleep he sang to me, in dreams he came
That voice which calls to me and speaks my name
And do I dream again? For now, I find
The Phantom of the Opera is there
Inside my mind

Sing once again with me, our strange duet
My power over you grows stronger yet
And though you turn from me to glance behind
The Phantom of the Opera is there
Inside your mind

Those who have seen your face
Draw back in fear
I am the mask you wear
It's me they hear
Your spirit and my voice
In one combined
The Phantom of the Opera is there
Inside your mind

He's there, the Phantom of the Opera
Beware, the Phantom of the Opera

In all your phantasies you always knew
That man and mystery were both in you
And in this labyrinth, where night is blind
The Phantom of the Opera is
Here inside your mind

Sing, my Angel of Music (Sing)
He's there the Phantom of the Opera
Sing for me
Oh sing my Angel, sing
Sing for me