Although it is not mentioned in the mod description, this mod changes the main theme to a song called "Macedonia Lullaby" by Benny Goodman and His Orchestra. I think the explosive triumphant trumpets finally broke me after like 4 years of having this mod so I decided to go into the files to find and delete it. If you want to delete it as well, follow these steps:
1) Open HOI4 launcher, find the mod, click the three dots, and open mod in folder
2) Go to music folder
3) The song is named "hoi4mainthemeallies" or something like that. Delete that ho
4) Idk if it is silent or just plays the default theme bc i havent launched it yet lol. My money is on the default theme. Enjoy