Don't know if I'm doing this right, but I've dragged all the needed cia files onto the sd card, and nothing on my new 3ds has changed. Do I need to do something else with the cia files once they're in the folder?
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan