You are the music in me...

You know the words "once upon a time"
Make you listen? There's a reason...
When you dream there's a chance you'll find
A little slaughter o a happy ever after
You're the harmony of the melody
which echoing inside my head
It's like I knew it before, I can't explain it...
I'm saying words I never said
But that was easy because you see the real me, the one I am