Opera hack

Hey everyone!

So I'm new to this forum because I think i might need some help in making my hack idea happen.
My idea is to have a hack of the opera scene and JUST the opera scene. Everything else can go haha.
I want to change out Celes Sprite, which is easy, but Im wondering how i could change the Music and the text + the scripted movement and timing.
As I'm not a super good coder (this hack is supposed to be part of my art school graduation...) I had quite some trouble understanding the tutorials when It comes to what I want to do.

I hope someone is here who could maybe help me get on the right track

to sum it up, what I basically want to do is:

1) Change the music
2) Change the Text
3) Change scripted movement and timing

Im grateful for every reply!
Jenny