Originally Posted by
The Hedge Knight
C:\Program Files (x86)\Steam\steamapps\common\total war shogun 2\data
Open up sound.pack with pack file manager (get it from tool tuts and resources if you dont have it already.
Extract the music section.
Listen to them and work out which pieces you want to replace which other pieces.
Copy the names of the pieces you want to replace. Rename the pieces you want to replace them with to have the same name.
Make a mod pack with the newly renamed files.
Hopefully this will make sense as you do it.