This tutorial was made just as a hobby
First, look for your game client's folder location.
From here, go to :
-> Legend - Legacy Of The Dragon (EN)
-> pubMusic
-> info
-> mustheme
-> dragons
You will see a list of mp3 files. These are the song that will be played based on which situation your character are facing. But for now, let's focus on 'fight' mp3 file.
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As a precaution, rename the 'fight' mp3 file as 'fight2' or whatever name you like as a backup when you want to change it back to normal.
Then, place the song you want to replace inside the 'dragons' folder and rename the song's file name into 'fight'.
Remember : The new song file you want to replace must be under pure .mp3 format to work.
For example : http://convert2mp3.net/en/
This website allows you to convert a video song directly from website into mp3 format and allows you to download it.
Once the file renamed and placed inside the 'dragons' folder, all done
This is an example, where I have fight and fight2 mp3 file.
fight = New song I have replaced.
fight2 = Old song as a backup.
Btw, I changed my battle song as an epic song. Where I only open when I'm having a great battle