The program doesn't run on the SD card. It's a one-time modification to your save file.
If you want to revert to your original song list, refer to this Q&A post:
Q: What happens if I change my music and later decide I want the originals back?
A: Simply load up the program, press the "Original Song Codes" button, and then load the file through Cheat Manager and GeckoOS.
If you want to revert to your original song list, refer to this Q&A post:
Q: What happens if I change my music and later decide I want the originals back?
A: Simply load up the program, press the "Original Song Codes" button, and then load the file through Cheat Manager and GeckoOS.