Homebrew How do I replace the music in Smash 3DS via SaltySD?

[WG481]

I want to add some boppin soundtracks (aka P5R, Dragon Quest, some music they don't have) and I wouldn't mind sacrificing songs.

How do I get the game not to crash when I load a new Nus3Bank? It seems to crash on boot if I have my custom song in the BGM folder.