Hello all who are reading this, I am noctisspector, the creator of the ultimate sides mod. If you have seen my my mod, you will notice that it is an era mod, so I have scripts with everything I need for the added maps, including music. I have some music from the last jedi and other movies that I want to replace the boring, non exciting music with. Is there any way I can somehow "Import" music to be played on that map?

I'd be careful about using music from other movies, for the same reasons that Pandemic didn't include the stock sounds with the ModTools: Copyrights.
Check this post for more info.