So I want to change a song from another mod, how do I do that?

[NullNic]

I wanted to change a song from Calamity (replacing scourge of the universe with the last battle remix that dm dokuro also made) using MY mod but I didn't know how to, does anyone know how to do this? I've seen many mods do this where they change a song but when I search it up I find nothing on how to change a song from a mod.