Not quite.
The use of the Emperor's Theme in that sequence makes a great deal of sense and your mock up edit proves it.
The other two in my opinion prove a point too, that neither of those sound additions add anything to the scene but having someone like yourself try it demonstrates what it would be like with them in much better than any mental speculation.
But that was down to some hard work on your part and not by the accidental throwing together of elements or from someone taking something you did that didn't quite work and expanding into something that works really well.
I have no problem with you doing this sort of thing (in fact I welcome it greatly) as long as you remain mindful of how it is labelled and ask permission to use other people's work.
Taking down the scribbled on poster was also a wise move as people are more likely to treat what you are doing seriously.
May I also add you're editing is showing much improvement compared to your earlier efforts, though your green crawl is in serious need of a redo.
