ROM Hack Question Where is Taiko no tatsujin Drum 'n' fun's song data

[LavieGS]

Hi, i want to change score of "Taiko No Tatsujin Drum 'n' fun!".
I know i need to change nus3bank, but i don't know how to get this file.
I already have score file(tja).
Please tell me how. (If there are other things that need to be changed, please let me know.)
Using: latest AMS
Having: Taiko No Tatsujin Drum 'n' fun (gamecard type)